chore: enable merge flag for generated bindings

[hamidzr]

Ticket

Description

I think I shouldn't have disabled merge on these. https://github.com/determined-ai/redacted/pull/262#issue-2566638197

have you seen your PRs getting blocked by: "merge conflict on openapi31.json" files? with the flag we have in git attributes and how it's a single line we've disabled git from automatically attempting to merge these files this changes that

reduce git merge conflicts by remove the -merge flag and saving the oapi spec as multiline text file.
https://git-scm.com/docs/gitattributes

Test Plan

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 54.39%. Comparing base (bdb56a4) to head (45768dc).
Report is 82 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10082      +/-   ##
==========================================
- Coverage   54.40%   54.39%   -0.01%     
==========================================
  Files        1267     1267              
  Lines      159321   159321              
  Branches     3632     3632              
==========================================
- Hits        86680    86670      -10     
- Misses      72507    72517      +10     
  Partials      134      134              

Flag	Coverage Δ
backend	45.56% <ø> (-0.02%)	⬇️
harness	72.55% <ø> (ø)
web	53.94% <ø> (ø)

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see 4 files with indirect coverage changes