Merge pull request #3469 from backstage/rugvip/scopeconf

cli: only load config schema that applies to the target package

.changeset/angry-bees-brush.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Only load config that applies to the target package for frontend build and serve tasks. Also added `--package <name>` flag to scope the config schema used by the `config:print` and `config:check` commands.

.changeset/sixty-eyes-shout.md

@@ -0,0 +1,6 @@
+---
+'@backstage/backend-common': patch
+'@backstage/integration': patch
+---
+
+Move the frontend visibility declarations of integrations config from @backstage/backend-common to @backstage/integration