chore(translate): add region tag 'v3_import_client_library'

[eapl-gemugami]

Description

Fixes Internal: b/410912736

Checklist

• I have followed guidelines from the CONTRIBUTING.MD
• Test passed: ../testing/vendor/bin/phpunit test/ -v -> I couldn't run tests in the local environment due to A keyfile was given, but it does not contain a project ID. As this change is adding comments it shouldn't affect previous behaviour.
• Lint passed: php-cs-fixer fix . --config .php-cs-fixer.dist.php
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• translate/src/v3_translate_text.php:21, tag translate_v3_import_client_library

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