chore: remove unused dependencies

Remove 30 dependencies across 18 packages that have no imports in
source code and are not peer dependencies of any other dependency.

Signed-off-by: Fredrik Adelöw <freben@spotify.com>
Made-with: Cursor

.changeset/remove-unused-deps.md

@@ -0,0 +1,22 @@
+---
+'@backstage/core-components': patch
+'@backstage/plugin-app-backend': patch
+'@backstage/plugin-catalog': patch
+'@backstage/plugin-catalog-backend-module-gitlab': patch
+'@backstage/plugin-catalog-backend-module-incremental-ingestion': patch
+'@backstage/plugin-catalog-graph': patch
+'@backstage/plugin-devtools-backend': patch
+'@backstage/plugin-kubernetes-node': patch
+'@backstage/plugin-notifications-common': patch
+'@backstage/plugin-notifications-node': patch
+'@backstage/plugin-permission-backend': patch
+'@backstage/plugin-scaffolder-backend-module-cookiecutter': patch
+'@backstage/plugin-scaffolder-backend-module-yeoman': patch
+'@backstage/plugin-search-backend': patch
+'@backstage/plugin-signals-node': patch
+'@backstage/plugin-techdocs-react': patch
+'@backstage/plugin-user-settings-backend': patch
+'@techdocs/cli': patch
+---
+
+Removed unused dependencies that had no imports in source code.