fix(workbox-build): make source map filename consistent with injected source file

[steverep]

Fixes #3233 per comments on #2239

• Name the output source map simply swDest with .map appended
• Replace the sourceMappingURL comment with the new filename
• Adjust tests to use different filenames for input and output
• Add simple test to check URL replacement

[steverep]

@jeffposnick would it be possible to get your review here? I just don't want to build a pipeline using this patch if you feel it's a no go.

[jeffposnick]

CC: @tropicadri and @petele for guidance.

[steverep]

At this point I'm wondering if workbox is even being maintained anymore? It hasn't been touched in 6 months even for just responding to issues and dependency bumps.

[steverep]

@tomayac any chance this could get looked at soon? It's not exactly a very taxing review.

[tomayac]

@tomayac any chance this could get looked at soon? It's not exactly a very taxing review.

At first sight this LGTM, but the tests fail. Could you look if it's related to this change? Thanks!

[steverep]

At first sight this LGTM, but the tests fail. Could you look if it's related to this change? Thanks!

I know they passed locally when I first created the PR but I'll take a quick look.

[steverep]

The same 8 tests fail on the v7 branch, so they have nothing to do with these changes.

[tomayac]

The same 8 tests fail on the v7 branch, so they have nothing to do with these changes.

Thanks for checking! @tropicadri, over to you for a final look. I LGTM.

[tomayac]

LGTM, approval.

Tests were manually verified to fail for unrelated reasons.