test(amber): add unit test coverage for AddressInfo

[aglinxinyuan]

What changes were proposed in this PR?

Adds AddressInfoSpec covering AddressInfo (amber/src/main/scala/org/apache/texera/amber/engine/architecture/deploysemantics/AddressInfo.scala), the case class the cluster scheduler uses to describe worker / controller node addresses. It has no test coverage today.

The new spec pins:

• Both fields (allAddresses, controllerAddress) round-trip from the case-class constructor.
• The order of allAddresses is preserved (the cluster scheduler picks workers based on this order, so any reorder is observable).
• An empty allAddresses array is accepted (controller-only configurations).
• The controller address may also appear in allAddresses (collocated mode).
• copy() allows one field to change while preserving the other.
• Case-class equality with an Array field is reference-based, not element-wise. This is locked down explicitly so a future change to (say) Seq doesn't silently flip the equality semantics for callers.

No production code changed; this is test-only.

Any related issues, documentation, discussions?

Closes #4915

How was this PR tested?

Added 6 new unit tests in AddressInfoSpec. Verified locally:

sbt 'WorkflowExecutionService/Test/testOnly org.apache.texera.amber.engine.architecture.deploysemantics.AddressInfoSpec'
# → Tests: succeeded 6, failed 0

sbt 'WorkflowExecutionService/Test/scalafmtCheck'
# → clean

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Generated-by: Claude Code

[Copilot]

Pull request overview

Adds missing unit test coverage for AddressInfo in Amber’s deploy-semantics layer, pinning expected case-class behavior that the cluster scheduler and callers may rely on (including Array equality semantics).

Changes:

• Introduces AddressInfoSpec with 6 unit tests covering constructor round-trip, allAddresses ordering, empty/collocated configurations, copy() behavior, and Array reference-equality semantics.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.32%. Comparing base (1872ca0) to head (95572eb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4916      +/-   ##
============================================
+ Coverage     42.17%   43.32%   +1.14%     
+ Complexity     2181     2179       -2     
============================================
  Files           980      915      -65     
  Lines         36298    32189    -4109     
  Branches       3783     3256     -527     
============================================
- Hits          15308    13945    -1363     
+ Misses        20065    17392    -2673     
+ Partials        925      852      -73     

Flag	Coverage Δ
amber	43.12% <ø> (-0.02%)	⬇️

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