revert(version): undo version refactor and tests, keep single-file change

Keep the User-Agent change as a single edit to
packages/core/src/infrastructure/http/request.ts. Remove the @homarr/version
package, the consumer migrations, and the unit tests.

packages/request-handler/package.json

@@ -29,7 +29,6 @@
     "@homarr/docker": "workspace:^0.1.0",
     "@homarr/integrations": "workspace:^0.1.0",
     "@homarr/redis": "workspace:^0.1.0",
-    "@homarr/version": "workspace:^0.1.0",
     "dayjs": "catalog:",
     "octokit": "catalog:",
     "superjson": "catalog:",