internal: fix inlineInvariant for cjs builds that require filenames with explicit extensions

[yaacovCR]

Current build script rewrites invariant to avoid function call if invariant true.

However, the rewriting should take into account the import name as rewritten (by TS?):

Current output for cjs is:

graphql-js/execution/execute.js

Line 14 in ba59ddd

const invariant_js_1 = require('../jsutils/invariant.js');

while the call is still:

graphql-js/execution/execute.js

Lines 723 to 724 in ba59ddd

	typeof stream.initialCount === 'number' ||
	invariant(false, 'initialCount must be a number');

yielding an error of the sort: invariant is not defined

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[IvanGoncharov]

Looks good!
We just need a comment documenting what we are testing in both files.
Otherwise ready to merge

[yaacovCR]

Looks good! We just need a comment documenting what we are testing in both files. Otherwise ready to merge

Ready for review -- checks should pass once #3849 is merged.

[IvanGoncharov]

@yaacovCR I rebased it on top of #3849 and merged it.