[DLP] Corrected Region tags for 6 DLP samples and made related code changes

[Avani-Thakker-Crest]

Description

Corrected Region tags for 6 DLP samples and made related code changes.

Fixes #

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Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 6 region tags.

• dlp/snippets/custom_infotype.py:415, tag dlp_inspect_string_omit_overlap
• dlp/snippets/custom_infotype.py:577, tag dlp_inspect_string_custom_hotword
• dlp/snippets/custom_infotype.py:736, tag dlp_inspect_custom_regex
• dlp/snippets/custom_infotype.py:799, tag dlp_inspect_hotword_rule
• dlp/snippets/inspect_content.py:23, tag dlp_inspect_phone_number
• dlp/snippets/templates.py:94, tag dlp_list_inspect_templates

You are about to delete 6 region tags.

• dlp/snippets/custom_infotype.py:415, tag dlp_omit_name_if_also_email
• dlp/snippets/custom_infotype.py:577, tag dlp_inspect_with_person_name_w_custom_hotword
• dlp/snippets/custom_infotype.py:739, tag dlp_inspect_with_medical_record_number_custom_regex_detector
• dlp/snippets/custom_infotype.py:802, tag dlp_inspect_with_medical_record_number_w_custom_hotwords
• dlp/snippets/inspect_content.py:25, tag dlp_inspect_string_basic
• dlp/snippets/templates.py:94, tag dlp_list_templates

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