Play Framework

refactor: remove deprecated 14-arg Http.Request.createRequest (PF-76)

Migrate all in-tree callers of the legacy 14-positional-parameter
Http.Request.createRequest overload to the modern createRequest(RequestData)
form, then delete the deprecated overload itself.

Sites migrated (7):
  - framework/src/play/test/FunctionalTest.java (newRequest)
  - framework/src/play/test/TestEngine.java
  - framework/test-src/play/PlayBuilder.java (initMvcObject)
  - framework/test-src/play/mvc/HttpRequestTest.java
  - framework/test-src/play/mvc/RouterTest.java (3 sites)

The RequestData record (Http.java:327) groups the 14 inputs into a single
parameter object, eliminating the positional-drift hazard the deprecated
overload was prone to (14 args, several adjacent same-typed booleans and
strings, easy to mis-order at the call site). Argument order in the record
matches the deprecated overload exactly, so the migration is mechanical.

Breaking change: this is a SemVer-major change for downstream Play adapter
modules that built Request instances via the legacy 14-arg form (e.g. the
PlayGrizzlyAdapter cited in the now-deleted Javadoc). Such adapters must
switch to createRequest(new Request.RequestData(...)) when consuming this
release.

Verification: ant clean unittest passes (BUILD SUCCESSFUL, 0 failures).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>