Fix spurious context clear when thread detached from wallclock profiling #6836
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What Does This Do
#6261 introduced a regression by conflating detachment from wallclock profiling with clearing profiling context, but sometimes we have to detach the current thread to avoid signalling it when it goes off CPU in certain states (e.g. to workaround a JDK bug where interrupted socket connects do not reduce the timeout before resuming) but the current thread should retain its context for all purposes.
Motivation
Additional Notes
Jira ticket: [PROJ-IDENT]