add register/unregister catalog entities mcp tools to software-catalog-mcp-tool (#1785)

Assisted-by: claude-4.5-sonnet (unit tests)

Author: gabemontero

workspaces/mcp-integrations/.changeset/petite-bobcats-watch.md

@@ -0,0 +1,5 @@
+---
+'@red-hat-developer-hub/backstage-plugin-software-catalog-mcp-tool': minor
+---
+
+add regsiter/unregister existing components to software-catalog-mcp-tool