avoid early bail out in migration manager

[cody-littley]

Describe your changes and provide context

Don't bail out early in the migration manager if the context gets cancelled.

Testing performed to validate your change

unit test coverage

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Apr 30, 2026, 7:22 PM

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Apr 27, 2026, 7:36 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.17%. Comparing base (f31742f) to head (4c77802).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3322      +/-   ##
==========================================
- Coverage   59.18%   59.17%   -0.01%     
==========================================
  Files        2097     2094       -3     
  Lines      172489   171628     -861     
==========================================
- Hits       102092   101566     -526     
+ Misses      61542    61268     -274     
+ Partials     8855     8794      -61     

Flag	Coverage Δ
sei-chain-pr	80.69% <ø> (?)
sei-db	70.41% <ø> (ø)

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

Files with missing lines	Coverage Δ
sei-db/state_db/sc/migration/migration_manager.go	96.13% <ø> (-0.04%)	⬇️

... and 71 files with indirect coverage changes

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