BQ Anomaly detection: Reshuffle fanout in cdc

[claudevdm]

Update cdc to match apache/beam#38015

[gemini-code-assist]

Summary of Changes

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This pull request simplifies the CDC Arrow batch decompression process by replacing a complex, manual sharding implementation with a more idiomatic Apache Beam Reshuffle. This change removes unnecessary configuration parameters and streamlines the data processing flow, aligning the implementation with recent updates in the Apache Beam codebase.

Highlights

• Refactored CDC Decompression Fan-out: Replaced the custom manual sharding logic (using GroupByKey with a custom trigger) with a standard beam.Reshuffle for fan-out, simplifying the pipeline and improving maintainability.
• Configuration Cleanup: Removed the 'decompress_shards' configuration parameter and replaced it with a boolean 'reshuffle_decompress' flag, simplifying the user interface for CDC decompression.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.03%. Comparing base (52f460a) to head (5426a03).
⚠️ Report is 53 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (52f460a) and HEAD (5426a03). Click for more details.

HEAD has 9 uploads less than BASE

Flag	BASE (52f460a)	HEAD (5426a03)
	10	1

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #3621       +/-   ##
=============================================
- Coverage     52.22%   37.03%   -15.20%     
+ Complexity     6053      470     -5583     
=============================================
  Files          1040      194      -846     
  Lines         62985    11387    -51598     
  Branches       6901     1130     -5771     
=============================================
- Hits          32896     4217    -28679     
+ Misses        27867     6832    -21035     
+ Partials       2222      338     -1884     

Components	Coverage Δ
spanner-templates	∅ <ø> (∅)
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	∅ <ø> (∅)
spanner-live-reverse-replication	∅ <ø> (∅)
spanner-bulk-migration	∅ <ø> (∅)
gcs-spanner-dv	∅ <ø> (∅)
see 871 files with indirect coverage changes

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[damccorm]

Thanks!

[damccorm]

Lets get a green signal on the python tests before merging