[CLOUDTRUST-8885] Migrated to keycloak 26.6.4

[TriveshElca]

Changes done:

• root pom.xml -> kc-cloudtrust-module update from 26.0.0 to 26.6.0-SNAPSHOT
• event-emitter-tests pom.xml -> kc-cloudtrust-testsuite update from 26.0.0 to 26.6.0-SNAPSHOT

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• AdminEvent() -> Keycloak added new getter(resourceId, which is derives from resourcePath. thus a field field in json representation) -> tests updated

• MockProducer (in tests) now accepts partitioner parameter, tests updated

• 2 new ResourceType Enum have been added (flatbuffers -> event.fbs)

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• 14 new EventType Enum have been added(flatbuffers -> event.fbs)

Important change for this : In the flatbuffers(event.fbs), for EventType enum which is of type byte, has reached its limit of 128. ( as adding the above 14 new eventType, the total is now 132 eventTypes, and byte can accomodate only up to 127).
Change done: change byte to ubyte which now can store up to 255 + small refactoring on the logic
byte -> -128 to 127
ubyte -> 0 to 255

enum EventType:byte -> enum EventType:ubyte