Update IDAKLU time stepping in tests and benchmarks

[MarcBerliner]

Description

This PR updates the IDAKLU tests and benchmarks to use the updated t_eval and t_interp arguments. This will speed up the github actions a bit and better reflect the performance of the IDAKLUSolver in benchmarks.

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• Optimization (back-end change that speeds up the code)

Key checklist:

• 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)
• All tests pass: $ python run-tests.py --all (or $ nox -s tests)
• 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:

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.42%. Comparing base (ac6c450) to head (c2f6b77).
Report is 200 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4390      +/-   ##
===========================================
- Coverage    99.46%   99.42%   -0.05%     
===========================================
  Files          292      292              
  Lines        22215    22215              
===========================================
- Hits         22097    22087      -10     
- Misses         118      128      +10     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[kratman]

Project wide coverage change is just from time conversion routines. It looks like util.py should be reworked a bit in the future. Probably a bunch of the functions can be cleaned up or tested better