fix: faster migrations for metrics table

[azhou-determined]

Description

consolidate and optimize previous migrations landed as part of profiling v2.

Test Plan

Commentary (optional)

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.

Ticket

[netlify]

✅ Deploy Preview for determined-ui canceled.

Name	Link
🔨 Latest commit	a5fc533
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/6604391dcc43d800084ccc4c

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.80%. Comparing base (e8dba6d) to head (a5fc533).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9060      +/-   ##
==========================================
- Coverage   47.80%   47.80%   -0.01%     
==========================================
  Files        1166     1166              
  Lines      143686   143686              
  Branches     2386     2386              
==========================================
- Hits        68690    68687       -3     
- Misses      74837    74840       +3     
  Partials      159      159              

Flag	Coverage Δ
backend	42.86% <ø> (-0.01%)	⬇️
harness	64.32% <ø> (ø)
web	40.75% <ø> (ø)

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see 3 files with indirect coverage changes