Return HTTP 400 for malformed date-range filter input

[turegjorup]

Malformed date-range filter input now returns HTTP 400 instead of leaking as a 500.

Changes

• DateRangeFilter resolves the client operator via a name lookup and throws ApiPlatform\Metadata\Exception\InvalidArgumentException on both invalid paths — a malformed between value and an unknown operator (field[foo]=…). The per-field throwOnInvalid flag is now honoured: when false the clause is skipped instead of throwing.
• config/packages/api_platform.yaml: fix the stale exception_to_status mapping to the current ApiPlatform\Metadata\Exception\InvalidArgumentException namespace (the old ApiPlatform\Exception\InvalidArgumentException class no longer exists, so the mapping was inert).
• Remove the now-dead classConstant.nameType entry from the PHPStan baseline (the dynamic DateLimit::{…} fetch is gone).
• Unskip FilterErrorTest and extend it with the unknown-operator and non-date-value (Elasticsearch-rejected → ElasticIndexException → 400) cases.
• Update the DateRangeFilterTest unit pins to the new behaviour.

Why

Two filter error paths leaked as HTTP 500: a malformed between threw PHP's native \InvalidArgumentException, and an unknown operator hit a raw \Error from DateLimit::{unknownKey}. Neither type was in exception_to_status. This is a prerequisite hardening step before the API Platform upgrade — malformed client input must surface as a 4xx, and the change is backwards-compatible (500 → 400 only).

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.68%. Comparing base (d6f37ac) to head (2550dd3).
⚠️ Report is 9 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #42      +/-   ##
=============================================
+ Coverage      71.89%   72.68%   +0.78%     
- Complexity       226      232       +6     
=============================================
  Files             29       29              
  Lines            637      648      +11     
=============================================
+ Hits             458      471      +13     
+ Misses           179      177       -2     

Flag	Coverage Δ
unittests	72.68% <100.00%> (+0.78%)	⬆️

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