Remove old user events support

[mdh1418]

New user_events support was added through #115265 that built upon existing eventpipe infrastructure, could emit both managed and native events as user_events (the old support could only emit native events), and unlike the old support, does not require the .NET app to be restarted nor ran with elevated permissions to emit user_events.

This PR removes the old support and removes the internal copy of LinuxTracePoints

Reverting #102523 led to merge conflicts that I resolved manually.

 git revert 7934e64
CONFLICT (content): Merge conflict in src/coreclr/dlls/mscoree/coreclr/CMakeLists.txt
CONFLICT (content): Merge conflict in src/coreclr/scripts/genEventing.py
CONFLICT (content): Merge conflict in src/coreclr/vm/eventing/CMakeLists.txt
CONFLICT (content): Merge conflict in src/native/external/cgmanifest.json

Reverting #104079 led to no merge conflicts

So as long as it's okay to completely revert those PRs, those conflicts were the only deviators.

[Copilot]

Pull Request Overview

This PR removes the old user_events support and the internal copy of LinuxTracepoints. The old support required elevated permissions and app restarts to emit user_events, while the new support added in PR #115265 uses the existing eventpipe infrastructure and can emit both managed and native events without these limitations.

Key changes:

• Complete removal of the internal LinuxTracepoints library copy
• Elimination of old user_events infrastructure that required elevated permissions
• Cleanup of build system references to the removed components

Reviewed Changes

Copilot reviewed 88 out of 129 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/native/external/LinuxTracepoints-version.txt	Removes version tracking file for the deleted LinuxTracepoints copy
src/native/external/LinuxTracepoints/libtracepoint-decode-cpp/include/tracepoint/*.h	Removes header files for the tracepoint decode library
src/native/external/LinuxTracepoints/libtracepoint-decode-cpp/README.md	Removes documentation for the decode library
src/native/external/LinuxTracepoints/libtracepoint-decode-cpp/CMakeLists.txt	Removes build configuration for the decode library
src/native/external/LinuxTracepoints/libtracepoint-control-cpp/tools/tracepoint-collect.cpp	Removes command-line tool for collecting tracepoints
src/native/external/LinuxTracepoints/libtracepoint-control-cpp/src/*.cpp	Removes implementation files for tracepoint control functionality
src/native/external/LinuxTracepoints/libtracepoint-control-cpp/samples/*.cpp	Removes sample code demonstrating library usage
src/native/external/LinuxTracepoints/libtracepoint-control-cpp/include/tracepoint/*.h	Removes header files for the control library
src/native/external/LinuxTracepoints/libtracepoint-control-cpp/CMakeLists.txt	Removes build configuration for the control library
src/native/external/LinuxTracepoints/libeventheader-tracepoint/src/*.c	Removes EventHeader tracepoint implementation
src/native/external/LinuxTracepoints/libeventheader-tracepoint/samples/*.cpp	Removes EventHeader sample applications
src/native/external/LinuxTracepoints/libeventheader-tracepoint/include/eventheader/*.h	Removes EventHeader header files
src/native/external/LinuxTracepoints/libeventheader-tracepoint/CMakeLists.txt	Removes build configuration for EventHeader library
src/native/external/LinuxTracepoints/libeventheader-decode-cpp/tools/decode-perf.cpp	Removes perf data decoding tool
src/native/external/LinuxTracepoints/libeventheader-decode-cpp/src/*.cpp	Removes EventHeader decode implementation
src/native/external/LinuxTracepoints/libeventheader-decode-cpp/samples/CMakeLists.txt	Removes build configuration for decode samples

[mdh1418]

Added folks that had taken a look at the PR that added the old support.

[jkotas]

Keep the license header?

[jkotas]

You may also need to delete https://github.com/dotnet/dotnet/blob/47f5d43906696f16182c42d3a6bb24f08aab1ee1/eng/allowed-vmr-binaries.txt#L106 and https://github.com/dotnet/dotnet/blob/47f5d43906696f16182c42d3a6bb24f08aab1ee1/repo-projects/runtime.proj#L59 once this integrates to VMR