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refactor(samples): modernize Admin API examples to use auto-generated GAPIC client - #2829
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…surface Adds getBaseClient() to BigtableInstanceAdminClient and marks all legacy handwritten veneer methods as @ObsoleteApi. This mirrors the recent changes to BigtableTableAdminClient in #2806. Tracking Bug: b/475818901
… GAPIC client
Refactors the Bigtable Admin API Java samples to use the modern, auto-generated proto-based methods via `getBaseClient()`. This aligns the samples with the ongoing effort to freeze the legacy handwritten
client and encourage the use of the underlying GAPIC client.
Specific changes:
* Updated `HelloWorld.java`, `TableAdminExample.java`, and `InstanceAdminExample.java` to call methods on the base GAPIC client instead of the legacy wrappers.
* Replaced legacy wrapper models with standard protobuf request objects (e.g., `com.google.bigtable.admin.v2.CreateTableRequest`, `com.google.bigtable.admin.v2.Instance`).
* Updated resource name strings to fully qualified formats (e.g., `projects/{project}/instances/{instance}`).
* Migrated garbage collection rule definitions to use the newly introduced `GcRuleBuilder`.
* Updated `InstanceAdminExampleTest.java` to remain compatible with the modified sample return types.
Tracking Bug: b/475818901
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refactor(samples): modernize Admin API examples to use auto-generated GAPIC client