chore: Integrate new gapic-generator-java and rules_gapic (#762)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 454027580

Source-Link: googleapis/googleapis@1b22277

Source-Link: https://github.com/googleapis/googleapis-gen/commit/e04cea20d0d12eb5c3bdb360a9e72b654edcb638
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiZTA0Y2VhMjBkMGQxMmViNWMzYmRiMzYwYTllNzJiNjU0ZWRjYjYzOCJ9

chore(deps): upgrade gapic-generator-java to 2.8.0 and update gax-java to 2.18.1
PiperOrigin-RevId: 450543911

Source-Link: googleapis/googleapis@5528344

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

java-scheduler/google-cloud-scheduler/src/main/java/com/google/cloud/scheduler/v1/CloudSchedulerClient.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;
@@ -125,7 +124,6 @@ public static final CloudSchedulerClient create(CloudSchedulerSettings settings)
    * Constructs an instance of CloudSchedulerClient, using the given stub for making calls. This is
    * for advanced usage - prefer using create(CloudSchedulerSettings).
    */
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public static final CloudSchedulerClient create(CloudSchedulerStub stub) {
     return new CloudSchedulerClient(stub);
   }
@@ -140,7 +138,6 @@ protected CloudSchedulerClient(CloudSchedulerSettings settings) throws IOExcepti
     this.stub = ((CloudSchedulerStubSettings) settings.getStubSettings()).createStub();
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   protected CloudSchedulerClient(CloudSchedulerStub stub) {
     this.settings = null;
     this.stub = stub;
@@ -150,7 +147,6 @@ public final CloudSchedulerSettings getSettings() {
     return settings;
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public CloudSchedulerStub getStub() {
     return stub;
   }
@@ -283,7 +279,7 @@ public final UnaryCallable<ListJobsRequest, ListJobsPagedResponse> listJobsPaged
    *           .build();
    *   while (true) {
    *     ListJobsResponse response = cloudSchedulerClient.listJobsCallable().call(request);
-   *     for (Job element : response.getResponsesList()) {
+   *     for (Job element : response.getJobsList()) {
    *       // doThingsWith(element);
    *     }
    *     String nextPageToken = response.getNextPageToken();

java-scheduler/google-cloud-scheduler/src/main/java/com/google/cloud/scheduler/v1/stub/CloudSchedulerStubSettings.java

@@ -204,7 +204,6 @@ public UnaryCallSettings<RunJobRequest, Job> runJobSettings() {
     return runJobSettings;
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public CloudSchedulerStub createStub() throws IOException {
     if (getTransportChannelProvider()
         .getTransportName()

java-scheduler/google-cloud-scheduler/src/main/java/com/google/cloud/scheduler/v1beta1/CloudSchedulerClient.java

@@ -126,7 +126,6 @@ public static final CloudSchedulerClient create(CloudSchedulerSettings settings)
    * Constructs an instance of CloudSchedulerClient, using the given stub for making calls. This is
    * for advanced usage - prefer using create(CloudSchedulerSettings).
    */
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public static final CloudSchedulerClient create(CloudSchedulerStub stub) {
     return new CloudSchedulerClient(stub);
   }
@@ -141,7 +140,6 @@ protected CloudSchedulerClient(CloudSchedulerSettings settings) throws IOExcepti
     this.stub = ((CloudSchedulerStubSettings) settings.getStubSettings()).createStub();
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   protected CloudSchedulerClient(CloudSchedulerStub stub) {
     this.settings = null;
     this.stub = stub;
@@ -151,7 +149,6 @@ public final CloudSchedulerSettings getSettings() {
     return settings;
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public CloudSchedulerStub getStub() {
     return stub;
   }
@@ -284,7 +281,7 @@ public final UnaryCallable<ListJobsRequest, ListJobsPagedResponse> listJobsPaged
    *           .build();
    *   while (true) {
    *     ListJobsResponse response = cloudSchedulerClient.listJobsCallable().call(request);
-   *     for (Job element : response.getResponsesList()) {
+   *     for (Job element : response.getJobsList()) {
    *       // doThingsWith(element);
    *     }
    *     String nextPageToken = response.getNextPageToken();

java-scheduler/google-cloud-scheduler/src/main/java/com/google/cloud/scheduler/v1beta1/stub/CloudSchedulerStubSettings.java

@@ -205,7 +205,6 @@ public UnaryCallSettings<RunJobRequest, Job> runJobSettings() {
     return runJobSettings;
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public CloudSchedulerStub createStub() throws IOException {
     if (getTransportChannelProvider()
         .getTransportName()