Clean up unreleased API surface

Since cli-module-auth and cli-module-actions are not yet released,
remove deprecated exports instead of keeping them. Also make httpJson
and getSecretStore internal to cli-node, duplicating the small httpJson
wrapper locally in each consuming package.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

yarn.lock

@@ -2830,6 +2830,7 @@ __metadata:
     "@backstage/cli": "workspace:^"
     "@backstage/cli-module-auth": "workspace:^"
     "@backstage/cli-node": "workspace:^"
+    "@backstage/errors": "workspace:^"
     cleye: "npm:^2.3.0"
   bin:
     cli-module-actions: bin/backstage-cli-module-actions