Always allow to setup JWKS URL in oidc idp

Closes #44217

Signed-off-by: Giuseppe Graziano <g.graziano94@gmail.com>

js/apps/admin-ui/maven-resources/theme/keycloak.v2/admin/messages/messages_en.properties

@@ -2456,7 +2456,7 @@ targetContextAttributes=Target Context Attributes
 targetContextAttributesHelp=Defines the evaluation of context attributes (claims) instead of identity attributes
 filteredByClaim=Verify essential claim
 rowCancelBtnAriaLabel=Cancel edits for {{messageBundle}}
-validateSignatureHelp=Enable/disable signature validation of external IDP signatures.
+validateSignatureHelp=Enable/disable signature validation of external IDP signatures. For Federated Client Authentication and JWT Authorization Grant the signature validation must be enabled.
 searchForFlow=Search for flow
 verifyEmail=Verify email
 addressClaim.locality.label=User Attribute Name for Locality

js/apps/admin-ui/src/identity-providers/add/DiscoverySettings.tsx

@@ -89,6 +89,7 @@ const Fields = ({ readOnly, isOIDC }: DiscoverySettingsProps) => {
           <DefaultSwitchControl
             name="config.validateSignature"
             label={t("validateSignature")}
+            labelIcon={t("validateSignatureHelp")}
             isDisabled={readOnly}
             stringify
           />