pkg/cpu: Reduce .text section error spam

[Sylfrena]

Fixes #1857

Why?

User report that logs are being spammed with

level=error name=parca-agent ts=2023-07-13T16:16:20.242517888Z caller=cpu.go:308 component=cpu_profiler msg="failed to add unwind table" pid=1890187 err="setUnwindTableForMapping for executable /root/.julia/artifacts/37805a06093bdc0d5938601719cf02fa0cf3aa68/lib/rr/librrpage.so starting at 0x6fffd000 failed: BuildID failed /proc/1890187/root/root/.julia/artifacts/37805a06093bdc0d5938601719cf02fa0cf3aa68/lib/rr/librrpage.so: could not find .text section"

in #1857

What?

Add a counter to keep track of said error and only logs it once every 50 times we hit the error case to reduce spamming the logs in default logging mode.

🤖 Generated by Copilot at 502844c

We search for the text in the maps of the dead
But sometimes we find nothing but ErrTextSectionNotFound
We track the errors and we log the doom
We need the unwind tables to escape the CPU's tomb

-->

[brancz]

Nice yes this is exactly the type of direction I was thinking of.