Add xdsl and xdsl-jax as dependencies of Catalyst

[mudit2812]

• Add xdsl and xdsl-jax to the requirements in setup.py
• Remove use of pytest.importorskip("xdsl") from the tests
• Add XDSL_TESTS argument to the Makefile for make pytest. ON by default
• Remove separate steps for xDSL tests in the GitHub workflows. Instead, xDSL tests are skipped by setting XDSL_TESTS=OFF or explicitly using the -m "not xdsl" pytest marker.
  • Question for reviewers: Should the check-pl-compat.yml workflow run tests that require graphviz to be installed?

[sc-105557]

[mudit2812]

To graphviz or not to graphviz?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.33%. Comparing base (9f08f42) to head (f89de8d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2282   +/-   ##
=======================================
  Coverage   97.33%   97.33%           
=======================================
  Files         107      107           
  Lines       12962    12962           
  Branches     1076     1076           
=======================================
  Hits        12616    12616           
  Misses        283      283           
  Partials       63       63           

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[joeycarter]

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