fix: release stream ids on request setup failure

[dkropachev]

Summary

• release a concrete stream ID when request frame creation fails
• release the ID when callback registration rejects the request
• preserve ownership after successful in-flight registration
• cover both failure windows with stateful stream-ID regression tests

Fixes #1002.

Tests

• JAVA_HOME=.../11.0.29-tem mvn -pl core -am -DskipITs -Dtest=InFlightHandlerTest -Dsurefire.failIfNoSpecifiedTests=false test

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