feat: add actual select all to glide tables [ET-238]

[EmilyBonar]

Ticket

ET-238
Ticket body:

When All Checkbox is selected, first select all visible runs, and show actual select all. When filter is applied, select all filtered runs.

For select checkbox – remove the “Select 5, 10, 25” options and remove the dropdown. Instead, we will simplify the experience to select all visible, select all in table, and none selected.

Also ensure this works on the new Flat Runs and Searches Views. The current flat runs view doesn’t have the count displayed at the moment.

All actions should be available on the frontend when the user has an actual select all selection or the selection contains otherwise unloaded runs or searches.

Description

When selection header is clicked it selects all items on page

When "Select all runs in table" is clicked it selects all items in table

When selection header is clicked again it unselects all items on page

Test Plan

• Ensure selection works as expected across Runs, Searches, and Experiments tables
• Ensure bulk actions work as expected across Runs, Searches, and Experiments tables
• Ensure comparison view works as expected across Runs and Experiments tables

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

Attention: Patch coverage is 59.86547% with 358 lines in your changes missing coverage. Please review.

Project coverage is 50.76%. Comparing base (deb3772) to head (a796368).
Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
webui/react/src/hooks/useSelection.ts	56.21%	88 Missing ⚠️
webui/react/src/pages/FlatRuns/FlatRuns.tsx	11.36%	78 Missing ⚠️
...bui/react/src/pages/F_ExpList/F_ExperimentList.tsx	0.00%	60 Missing ⚠️
webui/react/src/components/TableActionBar.tsx	59.30%	35 Missing ⚠️
webui/react/src/components/ExperimentMoveModal.tsx	53.48%	20 Missing ⚠️
webui/react/src/utils/task.ts	22.22%	14 Missing ⚠️
webui/react/src/components/Searches/Searches.tsx	75.47%	13 Missing ⚠️
webui/react/src/services/api.ts	84.28%	11 Missing ⚠️
webui/react/src/components/ComparisonView.tsx	66.66%	10 Missing ⚠️
...i/react/src/pages/FlatRuns/FlatRunActionButton.tsx	85.00%	6 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10081      +/-   ##
==========================================
- Coverage   54.55%   50.76%   -3.80%     
==========================================
  Files        1267      958     -309     
  Lines      159525   131025   -28500     
  Branches     3637     3662      +25     
==========================================
- Hits        87035    66515   -20520     
+ Misses      72357    64377    -7980     
  Partials      133      133              

Flag	Coverage Δ
harness	?
web	54.30% <59.86%> (+0.27%)	⬆️

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

Files with missing lines	Coverage Δ
.../react/src/components/ComparisonView.test.mock.tsx	99.32% <100.00%> (+0.01%)	⬆️
.../react/src/components/ExperimentActionDropdown.tsx	79.84% <100.00%> (+0.05%)	⬆️
...bui/react/src/components/ExperimentCreateModal.tsx	81.58% <100.00%> (ø)
webui/react/src/components/RunActionDropdown.tsx	95.61% <100.00%> (+0.01%)	⬆️
...components/RunFilterInterstitialModalComponent.tsx	97.77% <100.00%> (-0.08%)	⬇️
...ages/ExperimentDetails/ExperimentDetailsHeader.tsx	74.35% <100.00%> (+0.03%)	⬆️
webui/react/src/utils/experiment.ts	89.92% <100.00%> (ø)
webui/react/src/pages/ExperimentList.tsx	0.00% <0.00%> (ø)
webui/react/src/components/LoadableCount.tsx	94.31% <86.11%> (-5.69%)	⬇️
...ui/react/src/components/SearchTensorBoardModal.tsx	80.00% <44.44%> (ø)
... and 12 more

... and 310 files with indirect coverage changes

[ashtonG]

looks good, we're close -- there are one or two places where we might have overlooked something.

i think consolidating selection state and operations is a good move.