[release/9.0][browser] Disable debugger tests on CI (#108178)

[akoeplinger]

Backport of #108178 to release/9.0-staging

Fixes#128130

[akoeplinger]

Test-only change that we did in main already, marking Servicing-approved.

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[Copilot]

Pull request overview

This PR backports the change to disable (and remove CI wiring for) Mono WASM/browser debugger tests on the release/9.0 branch, addressing CI failures caused by environment/ICU differences (issue #128130).

Changes:

• Removes WASM debugger test submission/build wiring to Helix and eliminates the wasmdebuggertests scenario.
• Updates browser/wasm Helix targets and validation to drop the WasmDebuggerTests scenario.
• Removes pipeline templates and path-trigger subsets that previously scheduled debugger test jobs.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/mono/wasi/Makefile	Removes the Helix submission target for debugger tests.
src/mono/browser/Makefile	Removes Helix build/submission targets for debugger tests.
src/mono/browser/debugger/Wasm.Debugger.Tests/wasm.helix.targets	Deletes debugger-test-specific Helix work item generation.
src/mono/browser/debugger/Wasm.Debugger.Tests/Wasm.Debugger.Tests.csproj	Removes the HelixTargetsFile hook.
src/libraries/tests.proj	Stops building the debugger test traversal projects and adjusts wasm sample gating.
src/libraries/sendtohelix.proj	Removes special-casing for the debugger test scenario and host matrix.
src/libraries/sendtohelix-browser.targets	Removes WasmDebuggerTests scenario support and updates scenario validation error text.
eng/testing/tests.browser.targets	Removes WasmDebuggerTests scenario support and updates scenario validation error text.
eng/pipelines/runtime.yml	Removes scheduling of wasm debugger tests from main runtime pipeline.
eng/pipelines/extra-platforms/runtime-extra-platforms-wasm.yml	Removes wasm debugger jobs from extra-platforms/wasm pipelines.
eng/pipelines/common/templates/wasm-debugger-tests.yml	Deletes the dedicated wasm debugger tests pipeline template.
eng/pipelines/common/evaluate-default-paths.yml	Removes the wasmdebuggertests path subset used for CI triggering.

Comments suppressed due to low confidence (1)

eng/pipelines/extra-platforms/runtime-extra-platforms-wasm.yml:62

• With the debugger test jobs removed from this template, the debuggerTestsOnly mode now results in an empty pipeline (e.g., eng/pipelines/runtime-wasm-dbgtests.yml passes debuggerTestsOnly: true, but all job groups are gated on ne(parameters.debuggerTestsOnly, true) and excludeOptional defaults to true). Either delete/update runtime-wasm-dbgtests.yml and remove the debuggerTestsOnly parameter/conditions here, or repoint that pipeline to a remaining job group so it still runs something meaningful.

 # Disabled for now
#- template: /eng/pipelines/coreclr/perf-wasm-jobs.yml
#parameters:
#runProfile: 'v8'
#onlySanityCheck: true

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[akoeplinger]

/ba-g unrelated failures on Apple platforms