gh-98894: fix CheckDtraceProbes tests on Solaris

[kulikjak]

Solaris does not use the notes section to list available probes (readelf -n <binary> returns nothing), which makes the test_check_probes fail.

This PR adds a Solaris specific path which gets all the available probes by listing those available in the running test process instead.

The output below is very different so the comparison needs to be updated a little as well.

>>> import subprocess
>>> import os
>>> res = subprocess.run(["dtrace", "-l", "-P", f"python{os.getpid()}"])
   ID   PROVIDER            MODULE                          FUNCTION NAME
   34 python1427 libpython3.16.so.1.0                         sys_audit audit
   35 python1427 libpython3.16.so.1.0           sys_audit_tstate.part.0 audit
   36 python1427 libpython3.16.so.1.0             dtrace_function_entry function-entry
   37 python1427 libpython3.16.so.1.0          _PyEval_EvalFrameDefault function-entry
   38 python1427 libpython3.16.so.1.0            dtrace_function_return function-return
   39 python1427 libpython3.16.so.1.0          _PyEval_EvalFrameDefault function-return
   40 python1427 libpython3.16.so.1.0                   gc_collect_main gc-done
   41 python1427 libpython3.16.so.1.0                   gc_collect_main gc-start
   42 python1427 libpython3.16.so.1.0 import_find_and_load_with_name.isra.0 import-find-load-done
   43 python1427 libpython3.16.so.1.0 import_find_and_load_with_name.isra.0 import-find-load-start

A little unfortunate thing is that the test now requires elevated privileges, but that is true of all other DTrace tests as well, so I don't think that's a big deal.

BTW: there is Solaris specific ELF section for DTrace metadata and at first I wanted to fix the test by reading that one (with readelf -p .SUNW_dof <binary>). Unfortunately, the section includes more metadata than just available probes, and the now removed line probe is also present in the dumped strings (so test_check_probes passes, but test_missing_probes unexpectedly passes as well).

It's possible to use elfdump and do some binary parsing to extract only the available ones, but that is a huge overkill for a test like this. For those interested, the change is here: kulikjak@564e946

• Issue: Some DTrace probes are broken in 3.11 #98894