vc/fixup isapplicable use v2

[vchuravy]

• Use right caller for isapplicable usage
• use absint directly for applicable check
• fix nothing error
• fix return type
• Fix nmatches type mismatch
• forward sv and interp instead
• fixup! forward sv and interp instead

[github-actions]

Benchmark Results

	main	bf6c435...	main/bf6c435f13ceb2...
basics/overhead	4.34 ± 0.01 ns	4.03 ± 0.01 ns	1.08
time_to_load	1.16 ± 0.036 s	1.16 ± 0.015 s	1

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).

[wsmoses]

another excellent indicator here is that we've reduced the CI time from ~55 mins to ~45 minutes. Sadly not quite the ~30 mins I think we had before absint shenanigans [correctly tracking backedges] so maybe worth diving in after this too, but regardless a remarkable improvement.

[wsmoses]

lgtm, but would you mind bumping the enzymecore/enzyme project.toml's