make sure RestrictSystemAdmin returns for all users access system console (#30384)

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/api4/config_test.go

@@ -122,6 +122,7 @@ func TestGetConfigAnyFlagsAccess(t *testing.T) {
 	require.NoError(t, err)
 	t.Run("Can read value with permission", func(t *testing.T) {
 		assert.NotNil(t, cfg.FeatureFlags)
+		assert.NotNil(t, cfg.ExperimentalSettings.RestrictSystemAdmin)
 	})
 }
 

server/public/model/config.go

@@ -1137,7 +1137,7 @@ type ExperimentalSettings struct {
 	ClientSideCertEnable                                  *bool   `access:"experimental_features,cloud_restrictable"`
 	ClientSideCertCheck                                   *string `access:"experimental_features,cloud_restrictable"`
 	LinkMetadataTimeoutMilliseconds                       *int64  `access:"experimental_features,write_restrictable,cloud_restrictable"`
-	RestrictSystemAdmin                                   *bool   `access:"experimental_features,write_restrictable"`
+	RestrictSystemAdmin                                   *bool   `access:"*_read,write_restrictable"`
 	EnableSharedChannels                                  *bool   `access:"experimental_features"` // Deprecated: use `ConnectedWorkspacesSettings.EnableSharedChannels`
 	EnableRemoteClusterService                            *bool   `access:"experimental_features"` // Deprecated: use `ConnectedWorkspacesSettings.EnableRemoteClusterService`
 	DisableAppBar                                         *bool   `access:"experimental_features"`