perf can't find debug symbols in plugins

[c-taylor]

As discussed at ATS summit:

Due to the way ATS copies plugins before loading them and them immediately removes them.
Tools such as perf and gdb cannot find/load symbols without manually copying the plugin back into the temporary directory.

Ideally plugins would be left in place until they need to be removed.
This could be:

• Clean startup
• Clean exit

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. Marking it stale to flag it for further consideration by the community.

[c-taylor]

Still need this

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. Marking it stale to flag it for further consideration by the community.

[bryancall]

This is resolved on master. The plugin runtime copies are no longer deleted out from under a running process, which is what was breaking symbol resolution for perf and gdb. Two changes landed it: PR #11813 deferred deletion of reloadable remap plugins, then PR #12596 finished the job because the DSO files were still being deleted on a remap.config reload. The plugin factory destructor no longer removes the runtime directory; the loaded .so files are left in place, and obsolete copies are only cleaned up once a plugin is fully unloaded (with the empty directories swept on the next clean startup). The code comment now states the exact reason: deleting the .so files breaks debugging and symbol resolution. First release with the complete fix is 10.1.1. Closing as done; please reopen if you still see the copies removed while the process is running.