chore(deps): upgrade gapic-generator-java to 2.8.0 and update gax-jav…

…a to 2.18.1 (#351)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 450543911

Source-Link: googleapis/googleapis@5528344

Source-Link: https://github.com/googleapis/googleapis-gen/commit/9f6775cab1958982b88967a43e5e806af0f135db
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiOWY2Nzc1Y2FiMTk1ODk4MmI4ODk2N2E0M2U1ZTgwNmFmMGYxMzVkYiJ9

java-orgpolicy/google-cloud-orgpolicy/src/main/java/com/google/cloud/orgpolicy/v2/OrgPolicyClient.java

@@ -18,7 +18,6 @@
 
 import com.google.api.core.ApiFuture;
 import com.google.api.core.ApiFutures;
-import com.google.api.core.BetaApi;
 import com.google.api.gax.core.BackgroundResource;
 import com.google.api.gax.paging.AbstractFixedSizeCollection;
 import com.google.api.gax.paging.AbstractPage;
@@ -138,7 +137,6 @@ public static final OrgPolicyClient create(OrgPolicySettings settings) throws IO
    * Constructs an instance of OrgPolicyClient, using the given stub for making calls. This is for
    * advanced usage - prefer using create(OrgPolicySettings).
    */
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public static final OrgPolicyClient create(OrgPolicyStub stub) {
     return new OrgPolicyClient(stub);
   }
@@ -152,7 +150,6 @@ protected OrgPolicyClient(OrgPolicySettings settings) throws IOException {
     this.stub = ((OrgPolicyStubSettings) settings.getStubSettings()).createStub();
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   protected OrgPolicyClient(OrgPolicyStub stub) {
     this.settings = null;
     this.stub = stub;
@@ -162,7 +159,6 @@ public final OrgPolicySettings getSettings() {
     return settings;
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public OrgPolicyStub getStub() {
     return stub;
   }

java-orgpolicy/google-cloud-orgpolicy/src/main/java/com/google/cloud/orgpolicy/v2/stub/OrgPolicyStubSettings.java

@@ -260,7 +260,6 @@ public UnaryCallSettings<DeletePolicyRequest, Empty> deletePolicySettings() {
     return deletePolicySettings;
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public OrgPolicyStub createStub() throws IOException {
     if (getTransportChannelProvider()
         .getTransportName()