chore(Language): remove obsolete V1beta2 samples

[sofisl]

This PR removes obsolete sample files for Language that are no longer generated.

Testing Deletions

No core library classes were deleted in this PR, only orphaned sample files. The src/V1beta2 surface was already deleted in a prior PR, but its corresponding samples were mistakenly left behind.

Test Script:

<?php
require 'vendor/autoload.php';
echo "Testing client existence...\n";
if (class_exists('Google\Cloud\Language\V1beta2\LanguageServiceClient')) {
    echo "ERROR: LanguageServiceClient V1beta2 still exists!\n";
    exit(1);
} else {
    echo "SUCCESS: LanguageServiceClient V1beta2 does not exist.\n";
}

Output:

Testing client existence...
SUCCESS: LanguageServiceClient V1beta2 does not exist.

When the V1beta2 surface was previously deprecated and removed from google-cloud-php in PR #7385, OwlBot successfully deleted the core src/V1beta2 directory but failed to clean up the associated samples/V1beta2 directory. Librarian correctly removes these orphaned artifacts. There is no impact to the core client functionality since the underlying client code was already removed in the past.

For googleapis/librarian#7366

[snippet-bot]

Here is the summary of changes.

You are about to delete 7 region tags.

• Language/samples/V1beta2/LanguageServiceClient/analyze_entities.php:25, tag language_v1beta2_generated_LanguageService_AnalyzeEntities_sync
• Language/samples/V1beta2/LanguageServiceClient/analyze_entity_sentiment.php:25, tag language_v1beta2_generated_LanguageService_AnalyzeEntitySentiment_sync
• Language/samples/V1beta2/LanguageServiceClient/analyze_sentiment.php:25, tag language_v1beta2_generated_LanguageService_AnalyzeSentiment_sync
• Language/samples/V1beta2/LanguageServiceClient/analyze_syntax.php:25, tag language_v1beta2_generated_LanguageService_AnalyzeSyntax_sync
• Language/samples/V1beta2/LanguageServiceClient/annotate_text.php:25, tag language_v1beta2_generated_LanguageService_AnnotateText_sync
• Language/samples/V1beta2/LanguageServiceClient/classify_text.php:25, tag language_v1beta2_generated_LanguageService_ClassifyText_sync
• Language/samples/V1beta2/LanguageServiceClient/moderate_text.php:25, tag language_v1beta2_generated_LanguageService_ModerateText_sync

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