[MLIR] Enable Multithreading compilation

[erick-xanadu]

Context: Now that catalyst cli is its own subprocess, we have a more graceful failing mechanism. Let's fuzz the multithreading aspects of catalyst while there is no rush for the next release.

Description of the Change:

Benefits:

Possible Drawbacks:

Related GitHub Issues:

[sc-78851]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.39%. Comparing base (e3266de) to head (581ecac).

Additional details and impacted files

@@            Coverage Diff             @@
##            main    #1319       +/-   ##
==========================================
+ Coverage   0.37%   81.39%   +81.01%     
==========================================
  Files         17       74       +57     
  Lines       1346     8195     +6849     
  Branches      73      858      +785     
==========================================
+ Hits           5     6670     +6665     
- Misses      1341     1468      +127     
- Partials       0       57       +57     

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[mehrdad2m]

I remember when looking into the mlir-opt code, I found that they have warned against enabling it in general because it can potentially cause problem or slow down when parsing and also printing IR. So maybe just enabling it right before running the pass manager is safer. What do you think?