Use webpack's built in dynamic public path setting #12848
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Summary
Webpack 5 introduced built in capability to set the webpack public path dynamically, to allow proper loading of code splitting, and non-inlined assets.
We couldn't use this, as it wasn't compatible with IE11, but since dropping support we can.
Removes an unused IE11 shim in the frontend also.
References
Fixes #9062
Reviewer guidance
Nothing should be different behaviour wise as a result of this. Best things to check are places where we have large assets that should be loaded separately, ensuring they are still loaded as intended.