Remove all occurences of sourceMappingURL and sourceURL when JS files are aggregated

Problem/Motivation

We need to remove all occurrences of sourceMappingURL and sourceURL including the old //@ and new //# syntax. Otherwise these source map comments are causing 404 errors after the JS files are aggregated. After JS aggregation the source maps can no longer used.

This can be done with a regex in:

• D7: drupal_build_js_cache().
• D8: JsCollectionOptimizer::optimize()

Proposed resolution

Remove sourceMappingURL and sourceURL from JS files.

Remaining tasks

Review and commit.

User interface changes

None.

API changes

None.