POL-1386 Dangerfile Improvements

[XOmniverse]

Description

• Adds a test for whether verb "GET" is in use
• Updates comma separation test to have fewer false positives

[github-actions]

	1 Warning
⚠️	Important Files Modified Please make sure these modifications were intentional and have been tested. These files are necessary for configuring the Github repository and managing automation. .dangerfile/policy_tests.rb Dangerfile

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[nia-vf1]

LGTM