Update release build (#6504)

# Description
update release build yaml

## Type of change

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Fixes: #issue_number

## Auto-generated summary

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### <samp>🤖 Generated by Copilot at 09efdbb</samp>

### Summary
🔑🚀✏️

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1. 🔑 - This emoji represents the change in authentication method, since
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This pull request changes the release workflow for the
`radius-project/radius` repository. It uses a more secure authentication
method and simplifies the release titles.

> _The workflow for building was changed_
> _To use a new auth exchange_
> _The titles are shorter_
> _No more "Project" clutter_
> _The file `build.yaml` was rearranged_

### Walkthrough
* Set `GITHUB_TOKEN` to `GH_RAD_CI_BOT_PAT` secret for `gh` tool
authentication
([link](https://github.com/radius-project/radius/pull/6504/files?diff=unified&w=0#diff-d0777657fa3fd81d23aaf7273e58aee453b04e67882517900c56daeef9b3e4c1R323-R324))
* Remove "Project" from release title for consistency with repository
and branding
([link](https://github.com/radius-project/radius/pull/6504/files?diff=unified&w=0#diff-d0777657fa3fd81d23aaf7273e58aee453b04e67882517900c56daeef9b3e4c1L341-R343),
[link](https://github.com/radius-project/radius/pull/6504/files?diff=unified&w=0#diff-d0777657fa3fd81d23aaf7273e58aee453b04e67882517900c56daeef9b3e4c1L350-R352))

.github/workflows/build.yaml

@@ -320,6 +320,8 @@ jobs:
     name: Publish GitHub Release
     needs: ['build-and-push-cli']
     runs-on: ubuntu-latest
+    env:
+      GITHUB_TOKEN: ${{ secrets.GH_RAD_CI_BOT_PAT }}
     if: startsWith(github.ref, 'refs/tags/v')
     steps:
       - name: Checkout
@@ -338,7 +340,7 @@ jobs:
         run: |
           gh release create v${{ env.REL_VERSION }} \
             ${{ env.RELEASE_PATH }}/* \
-            --title "Project Radius v${{ env.REL_VERSION }}" \
+            --title "Radius v${{ env.REL_VERSION }}" \
             --generate-notes \
             --verify-tag \
             --prerelease
@@ -347,7 +349,7 @@ jobs:
         run: |
           gh release create v${{ env.REL_VERSION }} \
             ${{ env.RELEASE_PATH }}/* \
-            --title "Project Radius v${{ env.REL_VERSION }}" \
+            --title "Radius v${{ env.REL_VERSION }}" \
             --notes-file docs/release-notes/v${{ env.REL_VERSION }}.md \
             --verify-tag