Update workflows to test PR #600 refactor + rewrite injection regression for new API

[MaddyMicrosoft]

Two updates to align with PR Azure#600 (the pwsh -File refactor) on Azure/login:

testLogin.yml and real-login job in testLogin2.yml

• Point at MaddyMicrosoft/login@d5189a61e7fcf27d8c721f2a56dad25941833ae0
• This SHA is a test-release commit that includes the compiled lib/ bundle for PR Refactor PS login to use a static param()-bound script Azure/login#600's refactor

testLogin2.yml — new jobs

• run-unit-tests: runs the 30 unit tests (including the 6 SECURITY regression tests) from the same test-release SHA in a real runner
• ps-injection-regression (rewritten): now calls the new getAzPSLoginInvocation() API (which returns {args, env} instead of a script string), wraps the real AzPSLogin.ps1 with mocked Connect-AzAccount and Add-AzEnvironment, and asserts that the adversarial payloads pass through as inert param() values without creating a marker file. Tests all four fields (tenant-id, subscription-id, client-id, resourceManagerEndpointUrl).

Feel free to merge, or let me know if you'd rather I hold. The workflow files are yours 🙂