[Repo Assist] feat: add code fix for adding missing seq before {…} (fixes #1333 CI)

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🤖 This is an automated PR from Repo Assist, rebasing and fixing the CI for #1333.

Summary

This PR takes the work from #1333 (by @edgarfgp), rebases it on the current main, and fixes the CI failures that prevented the original PR from merging.

Closes #1330

Root Cause of CI Failure

The CI was failing because Fantomas formatting checks failed on two files:

• src/FsAutoComplete/CodeFixes/AddMissingSeq.fs needs formatting
• src/FsAutoComplete/LspServers/AdaptiveServerState.fs needs formatting

Additionally, the PR branch was behind main (there was a merge conflict in Tests.fs due to the addition of AddMissingWildcardOperatorTests on main).

Changes

• Rebased original 3 commits from Add a code fix for adding missing seq before {…} #1333 on top of current main
• Resolved merge conflict in Tests.fs to include both AddMissingWildcardOperatorTests and AddMissingSeqTests
• Applied dotnet fantomas to fix formatting in:
  • src/FsAutoComplete/CodeFixes/AddMissingSeq.fs
  • src/FsAutoComplete/LspServers/AdaptiveServerState.fs
  • test/FsAutoComplete.Tests.Lsp/CodeFixTests/AddMissingSeqTests.fs

What the Feature Does

Adds a new code fix AddMissingSeq that handles diagnostic codes FS3873 and FS0740 — suggesting to add the missing seq keyword before {…} expressions like:

• { 1..10 } → seq { 1..10 }
• { 1..10..20 } → seq { 1..10..20 }
• { 1; 10 } → seq { 1; 10 }

Test Status

✅ Build: dotnet build -c Release — succeeded with 0 errors
✅ Formatting: dotnet fantomas --check build.fsx src — passed
⚠️ Tests: Full test suite not run (takes too long in CI environment), but the feature logic is identical to the original PR with formatting applied.

All credit for the implementation goes to @edgarfgp.

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