Update webpack stage to catch html-webpack-plugin output

[dermoumi]

R: @jeffposnick @philipwalton

Fixes #2670

Change stage for InjectManifest in workbox-webpack-plugin to account for the output of html-webpack-plugin

Note: having issues running google-chrome-beta, even in headless mode, on a WSL2 environment. But tests up until that point pass with no problems.

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[dermoumi]

@googlebot I signed it!

[jeffposnick]

Thanks! I am looking for some clarity in webpack/webpack#11822 (comment) as to whether this is the right change to make.

[jeffposnick]

Thanks for this contribution—unfortunately, I think PROCESS_ASSETS_STAGE_ANALYSE ends up running our plugin too late, as it happens after, e.g., the CompressionPlugin's generation of a gzip-ed version of the final service worker.

My current tentative plan is switch to PROCESS_ASSETS_STAGE_OPTIMIZE_TRANSFER - 10 for the stage (i.e. "unofficially" run it right before the stage at which CompressionPlugin will run), but that's likely just a stopgap until the webpack team comes back with advice about a better solution.

(Additionally, the change needs to be made to the generate-sw.js file, and I'd like to update some dependencies to pick up the latest html-webpack-plugin version for our tests.)

Because of all that, I'm going to close this PR, and submit a PR with the changes outlined above instead. I do appreciate you taking the time to investigate the issue and submit some code, though, and I'll make sure to credit you in the release notes!