cleanup jscomp/test

[cometkim]

by mostly removing empty test files, outdated, dangling files.

[cknitt]

The empty .resi files were probably there on purpose so that no unnecessary exports are generated?
Not sure if that matters much though.

[cometkim]

I reviewed all and left other resi files if it was understandable

[cometkim]

jscomp/test files are still meaningful for regressions, but at the same time, many files are outdated or running unnecessarily, too. We need to consider a better testing strategy for the entire codebase (both ocaml/js). I'll try soon

[cknitt]

Ah, right, it's a bit weird, not all of these files have test code that is actually executed (Mt.from_pair_suites(__MODULE__, suites))?

Then it is good to remove the .resi so that we at least can see all generated code. 👍