chore(release): remove the trigger-release script (#5990)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: adrians5j

package.json

@@ -168,7 +168,6 @@
     "cy:ts": "yarn cypress:ts",
     "cy:setup": "yarn setup-cypress",
     "webiny-versions": "node ./scripts/webinyVersions.js",
-    "trigger-release": "node ./scripts/release/triggerRelease.js",
     "dispatch-github-event": "node ./scripts/dispatchGitHubEvent.js",
     "lint-staged": "lint-staged",
     "postinstall": "yarn node ./scripts/linkWorkspaces.js",