Cleanup and simplify hang dump implementation

[Youssef1313]

No description provided.

[Copilot]

Pull request overview

This PR simplifies the hang dump named-pipe environment variable naming by removing the application-path-based hash and using only a random per-run suffix, reducing coupling to ITestApplicationModuleInfo.

Changes:

• Remove the FNV-1a string hash helper previously used for pipe env-var key generation.
• Simplify HangDumpConfiguration.PipeNameKey to TESTINGPLATFORM_HANGDUMP_PIPENAME_<namedPipeSuffix> and align the activity indicator’s lookup logic.
• Simplify hang dump extension setup by removing unnecessary CurrentTestApplicationModuleInfo construction.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/Platform/Microsoft.Testing.Extensions.HangDump/Helpers/FNV1HashHelper.cs	Removes the now-unused hash helper.
src/Platform/Microsoft.Testing.Extensions.HangDump/HangDumpExtensions.cs	Stops constructing module-info solely for hashing; uses simplified configuration ctor.
src/Platform/Microsoft.Testing.Extensions.HangDump/HangDumpConfiguration.cs	Updates pipe env-var key generation to use only the random suffix.
src/Platform/Microsoft.Testing.Extensions.HangDump/HangDumpActivityIndicator.cs	Updates pipe env-var lookup to match the simplified naming scheme.

[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated no new comments.

[Evangelink]

Clean, well-scoped simplification. The old hash-based env var naming (TESTINGPLATFORM_HANGDUMP_PIPENAME_<hash>_<suffix> + a separate suffix env var) was unnecessary complexity — the pipe name itself is already a unique GUID. Collapsing to a single TESTINGPLATFORM_HANGDUMP_PIPENAME env var, removing HangDumpConfiguration, FNV_1aHashHelper, and ExitSignalActivityIndicatorTaskRequest removes 3 files and ~73 net lines while making the code easier to follow. The DESIGN.md is a valuable addition.

One minor nit about inconsistent GetPipeName overload usage (see inline). No blocking issues — all changed types are internal, so no public API surface concerns.