chore(monorepo): remove versions from private workspaces (#7306)

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Closes #

## 🎯 Changes

Remove the redundant `version` field from private/non-published
workspace packages.

Update `scripts/version.ts` because it previously assumed every package
in `packages/*` declared a local `version`. Once private workspaces like
`@trpc/tests` stop carrying that field, the script still needs a version
source for pinning `@trpc/*` dependencies, so it now falls back to the
repo version from `lerna.json`.

## ✅ Checklist

- [x] I have followed the steps listed in the [Contributing
guide](https://github.com/trpc/trpc/blob/main/CONTRIBUTING.md).
- [ ] If necessary, I have added documentation related to the changes
made.
- [ ] I have added or updated the tests related to the changes made.

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chores**
* Updated package version management configuration across example
projects and the build system.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

Author: KATT

package.json

@@ -69,6 +69,5 @@
   },
   "publishConfig": {
     "access": "restricted"
-  },
-  "version": "11.16.0"
+  }
 }