Chc cleanup hl7v2

[noerog]

Description

This is a continuation of #5691 but for v1 HL7v2.

Continuing fixes for:

b/183816408
b/158653137
b/159065286

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.6 (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)
• Please merge this PR for me once it is approved.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• healthcare/api-client/v1/hl7v2/hl7v2_stores.py:19, tag healthcare_create_hl7v2_store

You are about to delete 3 region tags.

• healthcare/api-client/v1/hl7v2/hl7v2_messages.py:22, tag healthcare_get_client
• healthcare/api-client/v1/hl7v2/hl7v2_stores.py:21, tag healthcare_get_client
• healthcare/api-client/v1/hl7v2/hl7v2_stores.py:35, tag healthcare_create_hl7v2_store

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[dandhlee]

LGTM.