Revert "Use Catch2 for benchmarks"

[nilsdeppe]

Proposed changes

This reverts commit c3c02f5.

Catch2's benchmarking capabilities are extremely primitive and not very useful in a practical situation. We need Google Benchmark.

Closes #5581

Basically, I can't actually optimize code very effectively with Catch2's benchmarking capabilities. Things like roofline analyses are not possible at all as far as I can tell.

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Further comments

[knelli2]

Test errors unrelated