[master] Support limiting the number of states running in parallel #66957
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What does this PR do?
Adds support for limiting the number of states executing in
parallelvia a new configuration calledstate_max_parallel.This solution is a bit ugly, but alternative implementations proved hard to be implemented in a backwards-compatible way or came with performance concerns.
Based on #66956
What issues does this PR fix or reference?
Fixes: #49301
Previous Behavior
No limit on the number of states running in parallel.
New Behavior
States running in parallel can be limited via configuration.
Merge requirements satisfied?
[NOTICE] Bug fixes or features added to Salt require tests.
Commits signed with GPG?
Yes