chore: Remove/archive trial collection code [WEB-938] [WEB-1289]

[mapmeld]

Description

Removes / archives a feature-flagged section in WebUI which we used to test out trial-level comparison.

Removing this section also allows us to remove:

• LearningCurveChart (new version uses chart from UI Kit)
• Table UI, types, and utilities only used in this part of WebUI
• TrialCollection-exclusive API endpoints;
• TrialCollection proto and bindings

Test Plan

App successfully builds, passes tests

Checklist

• Changes have been manually QA'd
• 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.

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[hkang1]

Thanks for cleaning this up, what a drop in lines! -14,827 :D

Couple of non-blocking comments, but was able to run test and build. The build seems to work as before.

[stoksc]

go side lgtm