Merge pull request #20618 from backstage/rugvip/runtime-filters

cli,config,frontend-app-api: config reading tweak + apply package detection filters at runtime

.changeset/chilled-sloths-rest.md

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+---
+'@backstage/frontend-app-api': patch
+---
+
+Filters for discovered packages are now also applied at runtime. This makes it possible to disable packages through the `app.experimental.packages` config at runtime.

.changeset/twelve-mirrors-brush.md

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+---
+'@backstage/cli': patch
+---
+
+The experimental package discovery will now always use the package name for include and exclude filtering, rather than the full module id. Entries pointing to a subpath export will now instead have an `export` field specifying the subpath that the import is from.