fix(flow-php/etl): cast() accepts null for an optional target

[norberttech]

Resolves: #xxx

Change Log

---

Added

• flow-php/types - TypeFactory::fromString() parses ?T into an optional type

Fixed

• flow-php/etl - cast() returns null for a null value when the target type is optional

Changed

Removed

Deprecated

Security

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.38%. Comparing base (cbad794) to head (1be9a6b).
⚠️ Report is 10 commits behind head on 1.x.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##                1.x    #2631      +/-   ##
============================================
- Coverage     84.39%   84.38%   -0.01%     
- Complexity    29865    30013     +148     
============================================
  Files          1996     2005       +9     
  Lines         86539    86899     +360     
============================================
+ Hits          73036    73332     +296     
- Misses        13503    13567      +64     

Components	Coverage Δ
etl	91.48% <100.00%> (-0.01%)	⬇️
cli	75.45% <ø> (ø)
lib-array-dot	96.52% <ø> (ø)
lib-azure-sdk	64.44% <ø> (ø)
lib-doctrine-dbal-bulk	70.36% <ø> (ø)
lib-filesystem	77.08% <ø> (+0.16%)	⬆️
lib-types	90.49% <100.00%> (+<0.01%)	⬆️
lib-parquet	70.23% <ø> (ø)
lib-parquet-viewer	82.26% <ø> (ø)
lib-snappy	89.86% <ø> (ø)
lib-dremel	0.00% <ø> (ø)
lib-postgresql	85.25% <ø> (-0.01%)	⬇️
lib-telemetry	86.62% <ø> (ø)
bridge-filesystem-async-aws	78.72% <ø> (-7.48%)	⬇️
bridge-filesystem-azure	80.96% <ø> (ø)
bridge-monolog-http	91.54% <ø> (ø)
bridge-monolog-telemetry	94.79% <ø> (ø)
bridge-openapi-specification	60.86% <ø> (ø)
symfony-http-foundation	56.86% <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	93.04% <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	95.97% <ø> (ø)
adapter-doctrine	93.62% <ø> (ø)
adapter-google-sheet	80.11% <ø> (ø)
adapter-http	76.52% <ø> (ø)
adapter-json	65.62% <ø> (ø)
adapter-logger	28.57% <ø> (ø)
adapter-parquet	75.30% <ø> (ø)
adapter-text	70.78% <ø> (ø)
adapter-xml	59.83% <ø> (ø)
adapter-avro	0.00% <ø> (ø)
adapter-excel	79.10% <ø> (ø)
adapter-postgresql	78.03% <ø> (ø)
adapter-seal	65.69% <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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