fix: clear all oauth Providers when reloading configuration (#5797)

* fix: clear all auth Providers when reloading configuration

Signed-off-by: wenhaozhou <wenhaozhou@yunify.com>

* fix:identity-provider test

Signed-off-by: wenhaozhou <wenhaozhou@yunify.com>

---------

Signed-off-by: wenhaozhou <wenhaozhou@yunify.com>

pkg/apiserver/authentication/identityprovider/identity_provider.go

@@ -47,6 +47,10 @@ type Identity interface {
 
 // SetupWithOptions will verify the configuration and initialize the identityProviders
 func SetupWithOptions(options []oauth.IdentityProviderOptions) error {
+	// Clear all providers when reloading configuration
+	oauthProviders = make(map[string]OAuthProvider)
+	genericProviders = make(map[string]GenericProvider)
+
 	for _, o := range options {
 		if oauthProviders[o.Name] != nil || genericProviders[o.Name] != nil {
 			err := fmt.Errorf("duplicate identity provider found: %s, name must be unique", o.Name)