refactor(flow-php/etl): remove union columns

[norberttech]

Resolves: #xxx

Change Log

---

Added

Fixed

• flow-php/etl-adapter-postgresql - array columns are typed list<?T> and can be written to Floe and Parquet

Changed

• flow-php/etl - null|T inside list, map and structure column types becomes ?T
• flow-php/etl - any other union inside a column type throws UnsupportedUnionTypeException
• flow-php/etl-adapter-json - JSON Schema anyOf nested in items or properties is refused

Removed

• flow-php/etl - UnionDefinition and union_schema()

Deprecated

Security

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.54%. Comparing base (96edb18) to head (d94cb2a).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##                1.x    #2657      +/-   ##
============================================
- Coverage     88.58%   88.54%   -0.04%     
- Complexity        0    26465   +26465     
============================================
  Files          2046     2042       -4     
  Lines         78197    77954     -243     
============================================
- Hits          69272    69028     -244     
- Misses         8925     8926       +1     

Components	Coverage Δ
etl	95.30% <100.00%> (-0.09%)	⬇️
cli	87.62% <ø> (ø)
lib-array-dot	96.52% <ø> (ø)
lib-azure-sdk	64.44% <ø> (ø)
lib-doctrine-dbal-bulk	94.24% <ø> (ø)
lib-filesystem	87.61% <ø> (ø)
lib-types	94.42% <ø> (-0.10%)	⬇️
lib-parquet	70.54% <ø> (+0.03%)	⬆️
lib-parquet-viewer	82.26% <ø> (ø)
lib-snappy	89.86% <ø> (ø)
lib-dremel	0.00% <ø> (ø)
lib-postgresql	89.34% <ø> (ø)
lib-telemetry	86.64% <ø> (ø)
bridge-filesystem-async-aws	92.76% <ø> (ø)
bridge-filesystem-azure	90.34% <ø> (ø)
bridge-filesystem-sftp	91.02% <ø> (ø)
bridge-monolog-http	96.84% <ø> (ø)
bridge-monolog-telemetry	94.79% <ø> (ø)
bridge-openapi-specification	91.45% <ø> (ø)
symfony-http-foundation	75.81% <ø> (ø)
bridge-psr18-telemetry	100.00% <ø> (ø)
bridge-psr3-telemetry	98.95% <ø> (ø)
bridge-psr7-telemetry	100.00% <ø> (ø)
bridge-telemetry-otlp	90.11% <ø> (ø)
bridge-symfony-http-foundation-telemetry	92.85% <ø> (ø)
bridge-symfony-filesystem-bundle	91.85% <ø> (ø)
bridge-symfony-filesystem-cache	98.18% <ø> (ø)
bridge-symfony-postgresql-bundle	93.62% <ø> (ø)
bridge-symfony-postgresql-cache	94.41% <ø> (ø)
bridge-symfony-postgresql-messenger	98.80% <ø> (ø)
bridge-symfony-postgresql-session	93.65% <ø> (ø)
bridge-symfony-telemetry-bundle	90.72% <ø> (ø)
adapter-chartjs	80.50% <ø> (ø)
adapter-csv	95.45% <ø> (ø)
adapter-doctrine	93.21% <ø> (ø)
adapter-google-sheet	99.31% <ø> (ø)
adapter-http	88.13% <ø> (ø)
adapter-json	90.97% <ø> (-0.07%)	⬇️
adapter-logger	44.44% <ø> (ø)
adapter-parquet	95.87% <ø> (ø)
adapter-text	95.45% <ø> (ø)
adapter-xml	88.86% <ø> (ø)
adapter-avro	7.14% <ø> (ø)
adapter-excel	95.88% <ø> (ø)
adapter-postgresql	95.79% <100.00%> (ø)
adapter-seal	83.88% <ø> (ø)
bridge-phpunit-postgresql	75.30% <ø> (ø)
bridge-phpunit-telemetry	87.36% <ø> (ø)
bridge-phpstan-types	0.00% <ø> (ø)
bridge-postgresql-valinor	100.00% <ø> (ø)

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