docs(samples): Code samples for Speech-to-Text V2

[nitsanshai]

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docs(samples): Code samples for Speech-to-Text V2
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[snippet-bot]

Here is the summary of changes.

You are about to add 7 region tags.

• samples/snippets/adaptation_v2_custom_class_reference.py:16, tag speech_adaptation_v2_custom_class_reference
• samples/snippets/adaptation_v2_inline_custom_class.py:16, tag speech_adaptation_v2_inline_custom_class
• samples/snippets/adaptation_v2_inline_phrase_set.py:16, tag speech_adaptation_v2_inline_phrase_set
• samples/snippets/adaptation_v2_phrase_set_reference.py:16, tag speech_adaptation_v2_phrase_set_reference
• samples/snippets/transcribe_file_v2.py:16, tag speech_transcribe_file_v2
• samples/snippets/transcribe_gcs_v2.py:16, tag speech_transcribe_gcs_v2
• samples/snippets/transcribe_streaming_v2.py:16, tag speech_transcribe_streaming_v2

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[dandhlee]

Approving for Cloud Next, I'll file an issue for some comments to be addressed in the future.

[dandhlee]

Running into resource exhausted / permissions issue. Resource exhausted should be fine if we re-run, but do you know which permissions I need to give for the tests @nitsanshai?