[management] Reuse a single cache store across all management server consumers (#5889)

* Add support for legacy IDP cache environment variable

* Centralize cache store creation to reuse a single Redis connection pool

Each cache consumer (IDP cache, token store, PKCE store, secrets manager,
EDR validator) was independently calling NewStore, creating separate Redis
clients with their own connection pools — up to 1400 potential connections
from a single management server process.

Introduce a shared CacheStore() singleton on BaseServer that creates one
store at boot and injects it into all consumers. Consumer constructors now
receive a store.StoreInterface instead of creating their own.

For Redis mode, all consumers share one connection pool (1000 max conns).
For in-memory mode, all consumers share one GoCache instance.

* Update management-integrations module to latest version

* sync go.sum

* Export `GetAddrFromEnv` to allow reuse across packages

* Update management-integrations module version in go.mod and go.sum

* Update management-integrations module version in go.mod and go.sum

management/internals/server/controllers.go

@@ -41,7 +41,8 @@ func (s *BaseServer) IntegratedValidator() integrated_validator.IntegratedValida
 			context.Background(),
 			s.PeersManager(),
 			s.SettingsManager(),
-			s.EventStore())
+			s.EventStore(),
+			s.CacheStore())
 		if err != nil {
 			log.Errorf("failed to create integrated peer validator: %v", err)
 		}