Centralize duplicated test-suite helpers into shared test/lib package

[Copilot]

This PR consolidates duplicated library-style test helpers that were spread across integration, security, and connector suites into a single shared package. It also removes all suite-level lib.go files and replaces them with content-scoped helper files.

• What changed

  • Added a new shared package: test/suites/lib
  • Moved common helpers into focused files:
    • assertions.go (error/status/header assertions)
    • cookies.go (session/refresh cookie extraction, request-editor helpers)
    • environment.go (host/port/env lookups)

• Suite refactor

  • Replaced monolithic suite lib.go files with content-based helper files:
    • test/suites/integration/helpers_*.go
    • test/suites/security/helpers_*.go
    • test/suites/connector/helpers_*.go
  • Kept suite-facing helper function names stable while delegating shared behavior to test/suites/lib.

• Repo cleanup

  • Removed:
    • test/suites/integration/lib.go
    • test/suites/security/lib.go
    • test/suites/connector/lib.go
  • Result: no lib.go files remain in the test suites.

// test/suites/connector/helpers_shared.go
type RequestEditorFn = testlib.RequestEditorFn

func verifyStatusCode(in int, expected int, t *testing.T) {
	testlib.VerifyStatusCode(in, expected, t)
}

[maansaake]

All helpers_ files you've created need to be moved to lib, I don't want any helpers_ files UNLESS they are needed specifically for several test suite test cases in that suite ONLY. Even then there should be special reasons to do so. In addition, you've actually reimplemented checks like CheckErr in individual helpers, make sure you use the lib package for helper-style functions now. Also, ensure you clean up lib_* files as well, there were some additional ones in the integration suite at least, maybe more.

[Copilot]

All helpers_ files you've created need to be moved to lib, I don't want any helpers_ files UNLESS they are needed specifically for several test suite test cases in that suite ONLY. Even then there sho...

Addressed in 314a66b. I removed all helpers_*.go and lib_*.go files from the suites, renamed them to content-based names, and kept helper-style behavior bound to the shared test/suites/lib package (including direct bindings for CheckErr/status/header/cookie/env helpers).