fix: display runs count in ProjectCard (ET-314)

[johnkim-det]

Ticket

ET-314

Description

ProjectCard should display runs count instead of experiments count when Flat Runs feature flag is on.

Test Plan

With Flat Runs feature flag on

• ProjectCards on dashboard should display number of runs, and the tooltip should say "runs" on hover
• Same on Workspace Details pages
  With Flat Runs feature flag on, they should still show experiments.

Checklist

• Changes have been manually QA'd
• New features have been approved by the corresponding PM
• User-facing API changes have the "User-facing API Change" label
• Release notes have been added as a separate file under docs/release-notes/
  See Release Note for details.
• Licenses have been included for new code which was copied and/or modified from any external code

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.64%. Comparing base (84072f6) to head (a2c5787).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9600      +/-   ##
==========================================
- Coverage   51.36%   46.64%   -4.72%     
==========================================
  Files        1252      929     -323     
  Lines      152174   123056   -29118     
  Branches     3024     3051      +27     
==========================================
- Hits        78158    57404   -20754     
+ Misses      73858    65496    -8362     
+ Partials      158      156       -2     

Flag	Coverage Δ
harness	?
web	48.61% <100.00%> (+0.63%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
webui/react/src/components/ProjectCard.tsx	100.00% <100.00%> (+100.00%)	⬆️
webui/react/src/types.ts	99.68% <100.00%> (+<0.01%)	⬆️

... and 328 files with indirect coverage changes