[Bug]: The gate change endpoint for POST uses fail-if-exists for override protection

[adamkorynta]

Describe the bug

The query parameter fail-if-exists is mislabeled and is instead used for the override protection flag.

Expected behavior

The query parameter should be override-protection matching the turbine change endpoint.

To Reproduce

1. Look at the code

   cwms-data-api/cwms-data-api/src/main/java/cwms/cda/api/location/kind/GateChangeCreateController.java

   Line 86 in 863215d

   dao.storeOperationalChanges(changes, failIfExists);

Priority

Medium

Logs/Incident Identifier

No response

CURL Commands

CDA Version

2026.08.14-testa

Additional context

No response