Move accessibility-scripts.sh over to generic-ci.sh in platform

Description

There's no reason for the a11y job to use its own script when every other context goes through generic-ci. Let's move it over to generic-ci.sh to improve consistency and simplify the flow of our jobs.

Steps to Reproduce

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Current Behavior

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Expected Behavior

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Reason for Variance

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Release Notes

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User Impact Summary

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Assignee

Unassigned

Reporter

Mike Youngstrom

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Story Points

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Priority

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