[lldb][debugserver] Synchronize interrupt and resume signals (#131073) This PR fixes a race condition in debugserver where the main thread calls MachProcess::Interrupt, setting `m_sent_interrupt_signo` while the exception monitoring thread is checking the value of the variable. I was on the fence between introducing a new mutex and reusing the existing exception mutex. With the notable exception of MachProcess::Interrupt, all the other places where we were already locking this mutex before accessing the variable. I renamed the mutex to make it clear that it's now protecting more than the exception messages. Jason, while investigating a real issue, had a suspicion there was race condition related to interrupts and I was able to narrow it down by building debugserver with TSan.
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