feat(bigqueryanalyticshub): promote multi-region support to GA

[modular-magician]

Description

This PR promotes the Multi-Region Listing (MRL) feature for BigQuery Analytics Hub to GA. It removes all min_version: beta guards from the YAML configurations and handwritten templates, and promotes the acceptance tests to the standard google provider.

Key Changes

• GA Promotion: Removed min_version: beta from all MRL fields and examples in Listing.yaml and ListingSubscription.yaml.
• Test Promotion: Promoted and renamed handwritten test files to standard .go files. Updated tests to use ProtoV5ProviderFactories.
• Reviewer Alignment: Addressed feedback regarding descriptive step naming in examples and the effective_replicas hierarchy fix.

Verification Performed

• Local End-to-End tests passed in the Beta provider.
• GA provider bootstrapping verified locally (creation of replicas succeeded); final apply was blocked by a known upstream InternalValidate issue in the compute service which is unrelated to these changes.

bigqueryanalyticshub: added `replica_locations` and `effective_replicas` fields to `google_bigquery_analytics_hub_listing` and `replica_locations` field to `google_bigquery_analytics_hub_listing_subscription` (ga)

Derived from GoogleCloudPlatform/magic-modules#16716