chore(ci): allow more granular AGW integration test execution

[Neudrino]

Summary

Changing from a toggle to a keyword for different test scenarios gives much more flexibility for further extension. Those extension capabilities are needed for the more granular management of test cases in the context of integration test implementation for containerized AGW.

Test Plan

• CI

[github-actions]

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[github-actions]

feg-workflow

    2 files  203 suites   40s ⏱️
374 tests 374 ✔️ 0 💤 0 ❌
388 runs  388 ✔️ 0 💤 0 ❌

Results for commit d7517ee.

[github-actions]

dp-workflow

14 tests   14 ✔️  2m 12s ⏱️
  1 suites    0 💤
  1 files      0 ❌

Results for commit d7517ee.

[github-actions]

agw-workflow

615 tests   611 ✔️  3m 47s ⏱️
    2 suites      4 💤
    2 files        0 ❌

Results for commit d7517ee.