feat(v1beta1): Allow users to explicitly configure universe domain

[parthea]

This PR fixes the issue where the client for google.cloud.gkehub_v1beta1 was not being updated automatically.

I followed the steps below to generate the changes in this PR:

1. Run the commands below in a clone of googleapis/googleapis

bazelisk build //google/cloud/gkehub/v1:gkehub-v1-py
bazelisk build //google/cloud/gkehub/v1/configmanagement:configmanagement-v1-py
bazelisk build //google/cloud/gkehub/v1/multiclusteringress:multiclusteringress-v1v1beta1-py
bazelisk build //google/cloud/gkehub/v1beta1:gkehub-v1beta1-py

2. Run the command below in a clone of this repository. The docker container will copy code from the bazel-bin directory of googleapis to the owl-bot-staging path specified in .OwlBot.yaml

docker run --rm --user $(id -u):$(id -g)   -v $(pwd):/repo   -v $HOME/git/googleapis/bazel-bin:/bazel-bin   gcr.io/cloud-devrel-public-resources/owlbot-cli:latest copy-bazel-bin   --source-dir /bazel-bin --dest /repo   --config-file=/packages/google-cloud-gke-hub/.OwlBot.yaml 

3. Run the command below in a clone of this repository. The docker container will copy the files from owl-bot-staging to the destination path specified in .OwlBot.yaml

docker run --user $(id -u):$(id -g) --rm -v $(pwd):/repo -w /repo gcr.io/cloud-devrel-public-resources/owlbot-python-mono-repo:latest

Fixes #12323 🦕

[snippet-bot]

Here is the summary of changes.

You are about to add 16 region tags.

• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_create_membership_async.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_CreateMembership_async
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_create_membership_sync.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_CreateMembership_sync
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_delete_membership_async.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_DeleteMembership_async
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_delete_membership_sync.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_DeleteMembership_sync
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_generate_connect_manifest_async.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_GenerateConnectManifest_async
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_generate_connect_manifest_sync.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_GenerateConnectManifest_sync
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_generate_exclusivity_manifest_async.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_GenerateExclusivityManifest_async
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_generate_exclusivity_manifest_sync.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_GenerateExclusivityManifest_sync
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_get_membership_async.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_GetMembership_async
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_get_membership_sync.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_GetMembership_sync
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_list_memberships_async.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_ListMemberships_async
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_list_memberships_sync.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_ListMemberships_sync
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_update_membership_async.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_UpdateMembership_async
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_update_membership_sync.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_UpdateMembership_sync
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_validate_exclusivity_async.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_ValidateExclusivity_async
• packages/google-cloud-gke-hub/samples/generated_samples/gkehub_v1beta1_generated_gke_hub_membership_service_validate_exclusivity_sync.py:26, tag gkehub_v1beta1_generated_GkeHubMembershipService_ValidateExclusivity_sync

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[parthea]

See this bug to update the copyright year: googleapis/gapic-generator-python#1911