fix(@angular-devkit/build-angular): ensure to use content hash as filenames hashing mechanism

[alan-agius4]

Previously we used hash which resulted in a unique hash generated for every build even when the contents of the files didn't differ.

More info: https://webpack.js.org/guides/caching/#output-filenames

NB: I did try to add a unit test, but it non trivial.

[dgp1130]

What exactly was non-deterministic that is fixed? I don't see anything too obvious being changed, is it updating .[hash:${length}] -> .[contenthash:${length}]?

[alan-agius4]

What exactly was non-deterministic that is fixed? I don't see anything too obvious being changed, is it updating .[hash:${length}] -> .[contenthash:${length}]?

Yes

[dgp1130]

I think this conflicted with another PR, I'd fix it in GitHub, but I think that will create a merge commit. Probably easier for you to fix when you get a chance @alan-agius4.

[dgp1130]

Merged to patch in #22623, so retargeting this PR to major.

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