fix: preserve ANY type through schema round-trip

[Ma77Ball]

What changes were proposed in this PR?

ArrowUtils.fromTexeraSchema now tags ANY attributes with texera_type=ANY metadata on the Arrow field, and toTexeraSchema reads that tag back. This mirrors the existing LARGE_BINARY mechanism. Without it, ANY round-trips
silently became STRING because both types share the same Arrow representation (Utf8).

Any related issues, documentation, or discussions?

Closes: #4762

How was this PR tested?

Updated ArrowUtilsSpec (in common/workflow-core): replaced the test that pinned the bug ("lose the ANY distinction") with one that asserts ANY is preserved through a round-trip, and added a test that the texera_type=ANY
metadata is attached only to ANY fields. Ran both WorkflowCore (27/27) and WorkflowOperator (14/14) ArrowUtilsSpec suites — all 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 @aicam

[aicam]

LGTM! @kunwp1 could you please review as well and approve

[kunwp1]

LGTM!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.78%. Comparing base (6b93b12) to head (4692507).

Files with missing lines	Patch %	Lines
...cala/org/apache/texera/amber/util/ArrowUtils.scala	25.00%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #4995   +/-   ##
=========================================
  Coverage     42.78%   42.78%           
- Complexity     2194     2198    +4     
=========================================
  Files          1045     1045           
  Lines         39985    39989    +4     
  Branches       4217     4220    +3     
=========================================
+ Hits          17106    17110    +4     
  Misses        21819    21819           
  Partials       1060     1060           

Flag	Coverage Δ		*Carryforward flag
access-control-service	39.53% <ø> (ø)
agent-service	33.72% <ø> (ø)		Carriedforward from 7879c2a
amber	43.50% <25.00%> (+0.01%)	⬆️
computing-unit-managing-service	0.00% <ø> (ø)
config-service	0.00% <ø> (ø)
file-service	32.18% <ø> (ø)
frontend	34.04% <ø> (ø)		Carriedforward from 7879c2a
python	88.90% <ø> (ø)		Carriedforward from 7879c2a
workflow-compiling-service	47.72% <ø> (ø)

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

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