fix: mark Document.Entity.type as REQUIRED in all versions (#817)

- [ ] Regenerate this pull request now.

fix: remove Document.Entity.bounding_poly_for_demo_frontend from v1beta2

The type field was always required by the backend, so this formally breaking change can likely be accepted without bumping the major version. Field removal is in beta version so can be accepted as well.

PiperOrigin-RevId: 444656928

Source-Link: googleapis/googleapis@a0d4c5c

Source-Link: https://github.com/googleapis/googleapis-gen/commit/d3a3f6dde18ec3721fceba933e4327a7b6dd2c2d
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiZDNhM2Y2ZGRlMThlYzM3MjFmY2ViYTkzM2U0MzI3YTdiNmRkMmMyZCJ9

chore(bazel): update version of Protobuf to v3.20.1
PiperOrigin-RevId: 444328399

Source-Link: googleapis/googleapis@c7ca416

Source-Link: https://github.com/googleapis/googleapis-gen/commit/d61705453a62b3ecda78aa30c192840ebc5a8a90
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiZDYxNzA1NDUzYTYyYjNlY2RhNzhhYTMwYzE5Mjg0MGViYzVhOGE5MCJ9

proto-google-cloud-document-ai-v1/src/main/java/com/google/cloud/documentai/v1/BatchDocumentsInputConfig.java

@@ -111,6 +111,8 @@ private BatchDocumentsInputConfig(
       }
     } catch (com.google.protobuf.InvalidProtocolBufferException e) {
       throw e.setUnfinishedMessage(this);
+    } catch (com.google.protobuf.UninitializedMessageException e) {
+      throw e.asInvalidProtocolBufferException().setUnfinishedMessage(this);
     } catch (java.io.IOException e) {
       throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
     } finally {
@@ -783,8 +785,9 @@ public Builder mergeGcsPrefix(com.google.cloud.documentai.v1.GcsPrefix value) {
       } else {
         if (sourceCase_ == 1) {
           gcsPrefixBuilder_.mergeFrom(value);
+        } else {
+          gcsPrefixBuilder_.setMessage(value);
         }
-        gcsPrefixBuilder_.setMessage(value);
       }
       sourceCase_ = 1;
       return this;
@@ -992,8 +995,9 @@ public Builder mergeGcsDocuments(com.google.cloud.documentai.v1.GcsDocuments val
       } else {
         if (sourceCase_ == 2) {
           gcsDocumentsBuilder_.mergeFrom(value);
+        } else {
+          gcsDocumentsBuilder_.setMessage(value);
         }
-        gcsDocumentsBuilder_.setMessage(value);
       }
       sourceCase_ = 2;
       return this;

proto-google-cloud-document-ai-v1/src/main/java/com/google/cloud/documentai/v1/BatchProcessMetadata.java

@@ -144,6 +144,8 @@ private BatchProcessMetadata(
       }
     } catch (com.google.protobuf.InvalidProtocolBufferException e) {
       throw e.setUnfinishedMessage(this);
+    } catch (com.google.protobuf.UninitializedMessageException e) {
+      throw e.asInvalidProtocolBufferException().setUnfinishedMessage(this);
     } catch (java.io.IOException e) {
       throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
     } finally {
@@ -660,6 +662,8 @@ private IndividualProcessStatus(
         }
       } catch (com.google.protobuf.InvalidProtocolBufferException e) {
         throw e.setUnfinishedMessage(this);
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(this);
       } catch (java.io.IOException e) {
         throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
       } finally {

proto-google-cloud-document-ai-v1/src/main/java/com/google/cloud/documentai/v1/BatchProcessRequest.java

@@ -127,6 +127,8 @@ private BatchProcessRequest(
       }
     } catch (com.google.protobuf.InvalidProtocolBufferException e) {
       throw e.setUnfinishedMessage(this);
+    } catch (com.google.protobuf.UninitializedMessageException e) {
+      throw e.asInvalidProtocolBufferException().setUnfinishedMessage(this);
     } catch (java.io.IOException e) {
       throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
     } finally {

proto-google-cloud-document-ai-v1/src/main/java/com/google/cloud/documentai/v1/BatchProcessResponse.java

@@ -79,6 +79,8 @@ private BatchProcessResponse(
       }
     } catch (com.google.protobuf.InvalidProtocolBufferException e) {
       throw e.setUnfinishedMessage(this);
+    } catch (com.google.protobuf.UninitializedMessageException e) {
+      throw e.asInvalidProtocolBufferException().setUnfinishedMessage(this);
     } catch (java.io.IOException e) {
       throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
     } finally {

proto-google-cloud-document-ai-v1/src/main/java/com/google/cloud/documentai/v1/BoundingPoly.java

@@ -106,6 +106,8 @@ private BoundingPoly(
       }
     } catch (com.google.protobuf.InvalidProtocolBufferException e) {
       throw e.setUnfinishedMessage(this);
+    } catch (com.google.protobuf.UninitializedMessageException e) {
+      throw e.asInvalidProtocolBufferException().setUnfinishedMessage(this);
     } catch (java.io.IOException e) {
       throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
     } finally {

proto-google-cloud-document-ai-v1/src/main/java/com/google/cloud/documentai/v1/CommonOperationMetadata.java

@@ -126,6 +126,8 @@ private CommonOperationMetadata(
       }
     } catch (com.google.protobuf.InvalidProtocolBufferException e) {
       throw e.setUnfinishedMessage(this);
+    } catch (com.google.protobuf.UninitializedMessageException e) {
+      throw e.asInvalidProtocolBufferException().setUnfinishedMessage(this);
     } catch (java.io.IOException e) {
       throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
     } finally {