No segfault when Python reactions fail

[edwardalee]

Before this PR, if a Python reaction fails with an exception, the exception is properly reported, but the process then segfaults. Here is a simple test case:

target Python
main reactor {
  reaction(startup) {=
    raise Exception("Reaction fails.")
  =}
}

This PR eliminates the explicit call to Py_FinalizeEx() on failure, relying instead on the Python runtime's own shutdown hooks.

Before this PR, running the above program results in the following:

$ bin/Test
---- System clock resolution: 1000 nsec
---- Start execution on Wed Oct 16 16:43:07 2024 ---- plus 713035000 nanoseconds
Environment 0: ---- Intializing start tag
Environment 0: ---- Spawning 1 workers.
ERROR: FATAL: Calling reaction _test_main.reaction_function_0 failed.
Traceback (most recent call last):
  File "/Users/edwardlee/LinguaFranca/test/Python/src-gen/Test/Test.py", line 46, in reaction_function_0
    raise Exception("Reaction fails.")
Exception: Reaction fails.
bin/Test: line 2: 54348 Segmentation fault: 11  /Users/edwardlee/.pyenv/shims/python3.10 /Users/edwardlee/LinguaFranca/test/Python/src-gen/Test/Test.py "$@"
$

After the change, we get this:

$ bin/Test
---- System clock resolution: 1000 nsec
---- Start execution on Wed Oct 16 16:40:45 2024 ---- plus 431395000 nanoseconds
Environment 0: ---- Intializing start tag
Environment 0: ---- Spawning 1 workers.
ERROR: FATAL: Calling reaction _test_main.reaction_function_0 failed.
Traceback (most recent call last):
  File "/Users/edwardlee/LinguaFranca/test/Python/src-gen/Test/Test.py", line 46, in reaction_function_0
    raise Exception("Reaction fails.")
Exception: Reaction fails.
$ 

This PR also aligns reactor-c to main (again).

[lhstrh]

👍

[Depetrol]

I've been noticing this in other PRs as well, but the lsp test seems to yield inconsistent results between workflow runs. See this run and this run(manual rerun) on the same commit. I think this is due to randomly inserted errors in ErrorInserter.java.

[lhstrh]

It's not inconsistent, it's partial and randomized.