DEV - Update conda-store build hook

[trallard]

Description

Recent updates to conda-store-ui broke the already brittle build process of conda-store-server and conda-store-ui. This PR aims to make this more robust and remove some hacky bits we have relied on until now.

Note that the UI counterpart is at https://github.com/conda-incubator/conda-store-ui/pull/418 so both PRs must be merged for the build and release to work.

Pull request checklist

• [x] Did you test this change locally?
• [x] Did you update the documentation (if required)?
• [ ] Did you add/update relevant tests for this change (if required)?

Additional information

This PR not only improves our build process but makes it so that one can build conda-store-server with a local copy repo/copy of conda-store-ui (vs only a released version). To test these two PRs together:

1. Check out https://github.com/conda-incubator/conda-store-ui/pull/418 in your local clone of conda-store-ui
2. Bundle the package as if for a release with run webpack:prod bundle
3. Check out this PR on your local clone of conda-store and cd to conda-store-server
4. Build conda-store-server with your local copy of conda-store-ui with export LOCAL_UI=<full path to the root the conda-store-ui repo> && hatch build --clean
5. Run conda-store-server in standalone mode:

# quick way to verify the build
conda-store-server --standalone

You should see the dev version of the UI

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