feat(managed-secrets): add centrally managed secrets with GITOPS_ prefix pushed to multiple targets

Introduce managed secrets owned by GitOps that can be defined once and
pushed to any combination of projects/groups across connections. Values
are stored in OS keychain, secrets appear on targets as GITOPS_{key}.

ts_interfaces/data/managedsecret.ts

@@ -0,0 +1,41 @@
+export interface IManagedSecretTarget {
+  connectionId: string;
+  scope: 'project' | 'group';
+  scopeId: string;
+  scopeName: string;
+}
+
+export type TPushStatus = 'pending' | 'success' | 'error';
+
+export interface IManagedSecretTargetStatus {
+  connectionId: string;
+  scope: 'project' | 'group';
+  scopeId: string;
+  scopeName: string;
+  status: TPushStatus;
+  error?: string;
+  lastPushedAt?: number;
+}
+
+export interface IManagedSecret {
+  id: string;
+  key: string;
+  description?: string;
+  targets: IManagedSecretTarget[];
+  targetStatuses: IManagedSecretTargetStatus[];
+  createdAt: number;
+  updatedAt: number;
+  lastPushedAt?: number;
+}
+
+export interface IManagedSecretStored {
+  id: string;
+  key: string;
+  description?: string;
+  value: string;
+  targets: IManagedSecretTarget[];
+  targetStatuses: IManagedSecretTargetStatus[];
+  createdAt: number;
+  updatedAt: number;
+  lastPushedAt?: number;
+}