fix: remove implicit MTK dependency, other bug fixes, MTKv9 compatibility

[AayushSabharwal]

Contrary to the name of the branch, this PR should be able to be merged without MTKv9

Checklist

• [ ] Appropriate tests were added
• [ ] Any code changes were done in a way that does not break public API
• [ ] All documentation related to code changes were updated
• [ ] The new code follows the contributor guidelines, in particular the SciML Style Guide and COLPRAC.
• [ ] Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[codecov[bot]]

Codecov Report

Attention: 55 lines in your changes are missing coverage. Please review.

Comparison is base (5d3ac43) 39.96% compared to head (7be3e98) 26.35%. Report is 6 commits behind head on master.

:exclamation: Current head 7be3e98 differs from pull request most recent head 3eb2f15. Consider uploading reports for the commit 3eb2f15 to get more accurate results

Files	Patch %	Lines
src/solutions/optimization_solutions.jl	12.90%	27 Missing :warning:
src/remake.jl	63.63%	12 Missing :warning:
src/scimlfunctions.jl	56.00%	11 Missing :warning:
src/solutions/solution_interface.jl	0.00%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #603 +/- ## =========================================== - Coverage 39.96% 26.35% -13.62% =========================================== Files 54 54 Lines 4076 4113 +37 =========================================== - Hits 1629 1084 -545 - Misses 2447 3029 +582 ```

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