rollup-plugin-typescript2
                                
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                        test: ensure `declarationMap` sources are correct
NOTE: this is built on top of #386 as the testDir changes there are required to have a correct outDir. As such, I've marked this PR as "Draft" until that PR is merged.
Summary
Add a test for declarationMap sources to make sure they're correct after #221 / #204
- Follow-up to https://github.com/ezolenko/rollup-plugin-typescript2/pull/371#issuecomment-1174339120
Details
- since we set a placeholder outDirinitially, TS sets declaration map sources to that placeholder dir- then, after #221, we remap that to the correct dir that Rollup outputs to
- this test checks that the remap happens and is correct
 
 
- then, after #221, we remap that to the correct dir that Rollup outputs to
CI failed on an integration test suite timeout, but this PR itself shouldn't have increased the time by more than some milliseconds, so think it makes sense to just re-run CI in this case.