ci: component at the top-level

Author: suztomo

release-please-config.json

@@ -2,10 +2,10 @@
   "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
   "separate-pull-requests": true,
   "include-component-in-tag": true,
+  "component": "gcp-lts-bom",
   "packages": {
     "boms/cloud-lts-bom": {
-        "component": "gcp-lts-bom",
-        "release-type": "java-yoshi"
+        "release-type": "java-backport"
     }
   },
   "bootstrap-sha": "6b9240114536a03b72929d5fade85599fbdbbdd0"