CRASM-2286- Refactor Playwright ECS task into its own bash script

[JCantu248]

🗣 Description

This PR moves the ECS run-task logic from the regression.yml file to its own bash script for ease of development, testing and maintenance.

💭 Motivation and context

This is necessary to get the workflow up and running.

🧪 Testing

The bash script that runs the ecs run-task logic has been tested locally before being integrated into the regression workflow logic. That logic still needs to be tested, but the most difficult task has been tested locally.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All future TODOs are captured in issues, which are referenced
  in code comments.
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• Tests have been added and/or modified to cover the changes in this PR.
• All new and existing tests pass.

[schmelz21]

@JCantu248 - thanks for maintaining this for so long. I get a good build and all test/checks are passing. I will merge on @aloftus23 , @cduhn17 and @jayjaybunce's approvals.

[aloftus23]

This looks good and am confident this will not affect P&E or XFD operations.