feat: Trials Comparison Frontend

[trentwatt]

Description

follow on to #4543. will rebase this after getting that merged.

Test Plan

Commentary (optional)

Checklist

• [ ] User-facing API changes need the "User-facing API Change" label.
• [ ] Release notes should be added as a separate file under docs/release-notes/. See Release Note for details.
• [ ] Licenses should be included for new code which was copied and/or modified from any external code.
• [ ] If modifying /webui/react/src/shared/ verify make -C webui/react test-shared passes.

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[ClaireNeveu]

Can you add a feature switch and show the tab when the feature switch is enabled?

[trentwatt]

Can you add a feature switch and show the tab when the feature switch is enabled?

ok done

[trentwatt]

Tests (except for downstream test which is currently broken from stylelint PR) passed here with only trivial changes since.