Remove GetCommandLineW from PAL

[huoyaoyuan]

No description provided.

[jkoritzinsky]

@dotnet/dotnet-diag-contrib for the EventPipe impact

[lateralusX]

What is the motivation behind doing the change?

[huoyaoyuan]

The motivation is to cleanup PAL layer and transit to minipal gradually.

[Copilot]

Pull request overview

This PR removes the PAL-provided GetCommandLineW implementation (and its PALSuite test) and updates CoreCLR callers to avoid relying on PAL command-line storage on Unix, using minipal executable-path facilities as a diagnostics fallback instead.

Changes:

• Remove GetCommandLineW and related command-line storage/cleanup from the Unix PAL implementation and headers.
• Update CoreCLR diagnostics command line fallback on Unix to use minipal_getexepath() and clarify the “approximate” nature of the value.
• Remove PALSuite coverage and build/list entries for the removed GetCommandLineW test.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/coreclr/vm/eventing/eventpipe/ep-rt-coreclr.h	Clarifies diagnostics command line is an approximation.
src/coreclr/vm/ceeload.cpp	Replaces Unix fallback from PAL GetCommandLineW to exe-path based fallback; updates command line construction on Unix.
src/coreclr/pal/tests/palsuite/paltestlist.txt	Removes GetCommandLineW PALSuite test entry.
src/coreclr/pal/tests/palsuite/miscellaneous/GetCommandLineW/test1/test.cpp	Deletes the GetCommandLineW PALSuite test source.
src/coreclr/pal/tests/palsuite/compilableTests.txt	Removes GetCommandLineW test from compilable list.
src/coreclr/pal/tests/palsuite/CMakeLists.txt	Stops building the removed GetCommandLineW test.
src/coreclr/pal/src/thread/process.cpp	Removes PAL GetCommandLineW and command-line storage/cleanup helpers.
src/coreclr/pal/src/init/pal.cpp	Removes argv→command-line formatting and updates PAL init path for CoreCLR initialization.
src/coreclr/pal/src/include/pal/procobj.hpp	Removes InitializeProcessCommandLine declaration.
src/coreclr/pal/src/include/pal/process.h	Removes PROCCleanupInitialProcess declaration.
src/coreclr/pal/inc/pal.h	Updates PAL_InitializeCoreCLR signature and removes GetCommandLineW declaration/macro.
src/coreclr/dlls/mscoree/exports.cpp	Updates coreclr_initialize to call new PAL_InitializeCoreCLR signature on Unix.

[jkotas]

@huoyaoyuan Please take a look at the copilot feedback above

[jkotas]

Could you please resolve conflicts?

[jkotas]

Thanks