Remove IREE solver

[kratman]

Description

Removes the IREE solver. The IREE solver only supports single precision and is difficult to update. It might be re-added in the future when it is more stable.

Fixes #4521

Key checklist:

• [x] No style issues: $ pre-commit run (or $ nox -s pre-commit) (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• [x] All tests pass: $ python run-tests.py --all (or $ nox -s tests)
• [x] The documentation builds: $ python run-tests.py --doctest (or $ nox -s doctests)

You can run integration tests, unit tests, and doctests together at once, using $ python run-tests.py --quick (or $ nox -s quick).

Further checks:

• [x] Code is commented, particularly in hard-to-understand areas
• [x] Tests added that prove fix is effective or that feature works

[kratman]

I am expecting some stuff to fail and for this branch to require additional changes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.20%. Comparing base (cb50363) to head (5670fb0). Report is 1 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #4585 +/- ## =========================================== - Coverage 99.26% 99.20% -0.06% =========================================== Files 302 302 Lines 22889 22705 -184 =========================================== - Hits 22721 22525 -196 - Misses 168 180 +12 ```

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[kratman]

@jsbrittain Can you look at this too please?