Update PR Template for QA accessibility testing

[mirano-darren]

Resolves #

Description

Significant changes or possible side effects

Automated test cases written

Steps to manually verify this change

This pull request is ready to review when

• Automated tests are updated (and all tests are passing)
• Pull request has been labeled, if applicable with feature, content, bug, tests, refactor
• Associated OpenAPI documentation has been updated
• The experience passes a basic manual accessibility audit (keyboard nav, screenreader, text scaling) OR an exemption is documented

This pull request can be merged when

• Code has been reviewed by someone other than the original author
• QA has verified the accessibility and functionality related to the change
• Design has approved the experience
• Product has approved the experience

[cms-eapd-bot]

See this pull request in action: https://ec2-34-232-189-82.compute-1.amazonaws.com

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