feat(migration): migrate legacy owner data and update config reference handling

- Implemented a migration process to move resources from the legacy owner "default" to the new default owner "local", ensuring no data loss during the transition.
- Updated configuration reference handling to replace legacy `$VAR_`, `$SECRET_`, and `$CONTEXT_` prefixes with mustache-style `{{ vars.name }}`, `{{ secrets.name }}`, and `{{ context.name }}`.
- Enhanced YAML configuration files and scripts to reflect the new mustache syntax, improving consistency across the application.
- Added tests to validate the migration process and ensure proper handling of legacy references.
- Updated documentation to guide users on the new configuration reference format.

packages/shared/src/index.js

@@ -2,3 +2,4 @@ export { isPlainObject } from "./is-plain-object.js";
 export { mergeProfileConfig, overlayFromMerged, configHasOverlay } from "./profile-config.js";
 export { ensureWorkflowFilename, suggestCopyFilename } from "./workflow-filename.js";
 export { HTTP_METHODS, namespacedPath, hasWorkflowTrigger } from "./workflow-path.js";
+export { DEFAULT_OWNER } from "./tenant.js";