chore!: [GeminiDataAnalytics] remove obsolete ContextRetrievalService files

[sofisl]

This PR removes obsolete structural files for GeminiDataAnalytics that are no longer generated.

Testing Deletions

I attempted to load the deleted classes to prove they do not exist anymore.

Test Script:

<?php
require 'vendor/autoload.php';
echo "Testing deleted classes...\n";
if (class_exists('Google\\Cloud\\GeminiDataAnalytics\\V1beta\\Client\\ContextRetrievalServiceClient')) {
    echo "ERROR: ContextRetrievalServiceClient still exists!\n";
    exit(1);
} else {
    echo "SUCCESS: ContextRetrievalServiceClient does not exist.\n";
}

Output:

Testing deleted classes...
SUCCESS: ContextRetrievalServiceClient does not exist.

BREAKING_CHANGE_REASON=In googleapis commit 7c4d9e72e0 (feat: Initial commit for GeminiDataAnalytics API service), the ContextRetrievalService and its related messages were explicitly removed from the v1beta proto surface. This was synced to google-cloud-php in PR #8533. OwlBot synced these changes but failed to delete the corresponding orphaned files in google-cloud-php. Librarian correctly removes these obsolete artifacts.

For googleapis/librarian#7366

[snippet-bot]

Here is the summary of changes.

You are about to delete 8 region tags.

• GeminiDataAnalytics/samples/V1beta/ContextRetrievalServiceClient/get_location.php:25, tag geminidataanalytics_v1beta_generated_ContextRetrievalService_GetLocation_sync
• GeminiDataAnalytics/samples/V1beta/ContextRetrievalServiceClient/list_locations.php:25, tag geminidataanalytics_v1beta_generated_ContextRetrievalService_ListLocations_sync
• GeminiDataAnalytics/samples/V1beta/ContextRetrievalServiceClient/retrieve_big_query_recent_relevant_tables.php:25, tag geminidataanalytics_v1beta_generated_ContextRetrievalService_RetrieveBigQueryRecentRelevantTables_sync
• GeminiDataAnalytics/samples/V1beta/ContextRetrievalServiceClient/retrieve_big_query_table_context.php:25, tag geminidataanalytics_v1beta_generated_ContextRetrievalService_RetrieveBigQueryTableContext_sync
• GeminiDataAnalytics/samples/V1beta/ContextRetrievalServiceClient/retrieve_big_query_table_contexts.php:25, tag geminidataanalytics_v1beta_generated_ContextRetrievalService_RetrieveBigQueryTableContexts_sync
• GeminiDataAnalytics/samples/V1beta/ContextRetrievalServiceClient/retrieve_big_query_table_contexts_from_recent_tables.php:25, tag geminidataanalytics_v1beta_generated_ContextRetrievalService_RetrieveBigQueryTableContextsFromRecentTables_sync
• GeminiDataAnalytics/samples/V1beta/ContextRetrievalServiceClient/retrieve_big_query_table_suggested_descriptions.php:25, tag geminidataanalytics_v1beta_generated_ContextRetrievalService_RetrieveBigQueryTableSuggestedDescriptions_sync
• GeminiDataAnalytics/samples/V1beta/ContextRetrievalServiceClient/retrieve_big_query_table_suggested_examples.php:25, tag geminidataanalytics_v1beta_generated_ContextRetrievalService_RetrieveBigQueryTableSuggestedExamples_sync

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[bshaffer]

These other class removals are considered breaking, but GeminiDataAnalytics is at version 0.12.0 (pre-GA), we do not need to release a new major version to make these chagnes.

Please remove (or move to a different PR) the phpstan changes and we can merge this.

[bshaffer]

Why are these changes part of a GeminiDataAnalytics PR? They do not seem related to the other changes in this PR, and the PHPStan check has passed in other PRs

If PHPstan needs to be fixed, it should be split into a separate PR.

[sofisl]

I have reverted the PHPStan changes from this PR, removed them from the PR body description, and opened a new PR for them here: #9581. This PR should be good to go as soon as #9581 merges (or whenever the PHPStan CI check here turns green!).