fix: support multi-type columns in flat run table

[keita-determined]

Ticket

ET-792

Description

• Support multi-type columns in flat run table in case there are the same column names with different types.

Test Plan

• Add columns from column picker, and columns show the right data even if there are the same column name like metadata.
• Column header shows its types.
  • some special columns does not show types since types are unknown

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 24.00000% with 38 lines in your changes missing coverage. Please review.

Project coverage is 50.46%. Comparing base (c6c476c) to head (4e3c1c6).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
webui/react/src/pages/FlatRuns/FlatRuns.tsx	5.55%	17 Missing ⚠️
webui/react/src/pages/FlatRuns/columns.ts	0.00%	12 Missing ⚠️
webui/react/src/pages/F_ExpList/expListColumns.ts	0.00%	6 Missing ⚠️
webui/react/src/utils/flatRun.ts	75.00%	2 Missing ⚠️
webui/react/src/components/Searches/columns.ts	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10066      +/-   ##
==========================================
- Coverage   54.45%   50.46%   -4.00%     
==========================================
  Files        1267      957     -310     
  Lines      159440   130680   -28760     
  Branches     3633     3633              
==========================================
- Hits        86820    65943   -20877     
+ Misses      72486    64603    -7883     
  Partials      134      134              

Flag	Coverage Δ
harness	?
web	53.93% <24.00%> (-0.01%)	⬇️

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

Files with missing lines	Coverage Δ
webui/react/src/components/Searches/columns.ts	51.78% <83.33%> (-0.11%)	⬇️
webui/react/src/utils/flatRun.ts	97.61% <75.00%> (-1.54%)	⬇️
webui/react/src/pages/F_ExpList/expListColumns.ts	20.98% <0.00%> (+0.04%)	⬆️
webui/react/src/pages/FlatRuns/columns.ts	18.29% <0.00%> (-0.20%)	⬇️
webui/react/src/pages/FlatRuns/FlatRuns.tsx	11.12% <5.55%> (-0.01%)	⬇️

... and 310 files with indirect coverage changes