Add CLI exit event

[WillDaSilva]

I've tested this manually using Snowplow Micro. We could add automated testing for it by checking if Meltano subprocesses that exit with various exit codes behave properly. We'll probably want to resolve #2955 prior to adding such tests, as otherwise actually verifying the behaviour will be tricky, regardless of whether it works or not.

(resolve is in backticks to stop GitHub from automatically closing #2955)

Closes #5986

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[codecov-commenter]

Codecov Report

Merging #6142 (74c84f2) into main (c41c2c1) will decrease coverage by 0.04%.
The diff coverage is 36.36%.

❗ Current head 74c84f2 differs from pull request most recent head 0833aa1. Consider uploading reports for the commit 0833aa1 to get more accurate results

@@            Coverage Diff             @@
##             main    #6142      +/-   ##
==========================================
- Coverage   90.65%   90.60%   -0.05%     
==========================================
  Files         267      267              
  Lines       18732    18750      +18     
==========================================
+ Hits        16982    16989       +7     
- Misses       1750     1761      +11     

Impacted Files	Coverage Δ
src/meltano/cli/__init__.py	38.23% <25.00%> (-7.60%)	⬇️
src/meltano/core/tracking/tracker.py	82.71% <50.00%> (-1.70%)	⬇️
tests/meltano/cli/test_elt.py	98.64% <0.00%> (+0.27%)	⬆️

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[aaronsteers]

A couple small changes requested.

If no other major changes, you can merge after those (and after your own testing).

If other large factors are changed/added, please let me know and I'll do another review round.

[aaronsteers]

Looks great! Thanks!

[WillDaSilva]

Apologies for merging #6146 into this. I forgot that it wasn't targeting main.

[aaronsteers]

Apologies for merging #6146 into this. I forgot that it wasn't targeting main.

@WillDaSilva - not a problem. It happens.

I like what you updated there so it shouldn't be an issue.