fix: update copy in experiment and trial headers

[ashtonG]

Ticket

ET-837

Description

This updates the experiment header and the trial header to have correct copy when f_flat_runs is on.

Test Plan

with f_flat_runs on, visit a trial page

• the experiment header should have the experiment id as search id_number
• the trial header should have the trial id as run id_number

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.50%. Comparing base (f45ebb9) to head (4235c9c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10111      +/-   ##
==========================================
- Coverage   54.48%   50.50%   -3.99%     
==========================================
  Files        1267      957     -310     
  Lines      159437   130657   -28780     
  Branches     3636     3638       +2     
==========================================
- Hits        86863    65982   -20881     
+ Misses      72441    64542    -7899     
  Partials      133      133              

Flag	Coverage Δ
harness	?
web	54.02% <100.00%> (+<0.01%)	⬆️

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

Files with missing lines	Coverage Δ
...ages/ExperimentDetails/ExperimentDetailsHeader.tsx	74.32% <100.00%> (ø)
.../src/pages/TrialDetails/Header/TrialHeaderLeft.tsx	81.13% <100.00%> (+0.73%)	⬆️

... and 310 files with indirect coverage changes

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