RESTful service: List Web Applications - Suppress Keycloak Client ID for local Web Services

[gunterze]

Suppress Keycloak Client ID in returned list of Web Applications by GET /dcm4chee-arc/webapps for Web Applications secured by the same Keycloak realm as the UI of this Archive instance, where following System and KeycloakClient properties matches:

System property	Keycloak Client property
System.getProperty("auth-server-url")	keycloakServerURL
System.getProperty("realm-name", "dcm4che")	keycloakRealm

Rationale:
Simplify for the UI to distinguish, if it has to fetch a new token by GET ​/token2​/{webAppName} or it can use the token it already has fetched from Keycloak.

Improves #1331
Requires dcm4che/dcm4che#509

[petrkalina]

I believe it is relevant to check also if the keycloak client ID is dcm4chee-arc-ui - otherwise the client id is not returned for i.e.:

dn: dcmKeycloakClientID=arr-gatekeeper,dicomDeviceName=log,cn=Devices,cn=DICOM Configuration,dc=dcm4che,dc=org
objectClass: dcmKeycloakClient
dcmKeycloakClientID: arr-gatekeeper
dcmKeycloakRealm: dcm4che
dcmURI: https://auth:8843/auth
dcmKeycloakClientSecret: {secret}
dcmTLSAllowAnyHostname: TRUE