fix: register OneToOnePartition in PartitionInfo @JsonSubTypes

[Ma77Ball]

What changes were proposed in this PR?

PartitionInfo's @JsonSubTypes array listed every concrete subclass except OneToOnePartition, so Jackson could not resolve that discriminator, and the round-trip was broken for any payload carrying a OneToOnePartition. This PR adds the missing new Type(value = classOf[OneToOnePartition], name = "oneToOne") entry alongside the other five subtypes. The PartitionInfoSpec test that pinned the (buggy) five-entry registration set, and its sibling pendingUntilFixed test that documented the intended six-entry set, are merged into a single assertion covering all six concrete subclasses.

Any related issues, documentation, or discussions?

Closes: #4805

How was this PR tested?

Updated PartitionInfoSpec to assert the full six-entry registration set, including OneToOnePartition. sbt scalafmtAll ran clean. CI scalatest run on workflow-core is expected to pass.

Was this PR authored or co-authored using generative AI tooling?

Co-authored with Claude Opus 4.7 in compliance with ASF

[Ma77Ball]

/request-review @Yicong-Huang

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.83%. Comparing base (b492a62) to head (08dd8cc).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5033      +/-   ##
============================================
+ Coverage     42.79%   42.83%   +0.04%     
+ Complexity     2198     2195       -3     
============================================
  Files          1045     1031      -14     
  Lines         39985    38156    -1829     
  Branches       4217     4007     -210     
============================================
- Hits          17111    16346     -765     
+ Misses        21815    20791    -1024     
+ Partials       1059     1019      -40     

Flag	Coverage Δ		*Carryforward flag
access-control-service	39.53% <ø> (ø)
agent-service	33.72% <ø> (ø)		Carriedforward from 6832cfa
amber	43.50% <ø> (-0.03%)	⬇️
computing-unit-managing-service	0.00% <ø> (ø)
config-service	0.00% <ø> (ø)
file-service	32.18% <ø> (ø)
frontend	33.08% <ø> (-0.96%)	⬇️	Carriedforward from 6832cfa
python	88.89% <ø> (-0.01%)	⬇️	Carriedforward from 6832cfa
workflow-compiling-service	47.72% <ø> (ø)

*This pull request uses carry forward flags. Click here to find out more.

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[Yicong-Huang]

LGTM

[Ma77Ball]

@Yicong-Huang, thank you for the review. When available, please merge.

[Yicong-Huang]

Thanks. I left the PR open intentionally to test the merge queue feature. Apparently it is still not functioning yet (I don't see merge queue button). Will merge this one now and we can test on other PRs (randomly).