ci: update release candidate workflow (#6624)

Author: joshblack

.github/workflows/release_candidate.yml

@@ -41,9 +41,15 @@ jobs:
 
       - name: Publish release candidate
         run: |
-          pkg_json_path=packages/react/package.json
-          version=$(jq -r .version $pkg_json_path)
-          echo "$( jq ".version = \"$(echo $version)-rc.$(git rev-parse --short HEAD)\"" $pkg_json_path )" > $pkg_json_path
+          if [[ -f '.changeset/pre.json' ]]; then
+            npx changeset pre exit
+            npx changeset version --snapshot
+          else
+            pkg_json_path=packages/react/package.json
+            version=$(jq -r .version $pkg_json_path)
+            echo "$( jq ".version = \"$(echo $version)-rc.$(git rev-parse --short HEAD)\"" $pkg_json_path )" > $pkg_json_path
+          fi
+
           npx changeset publish --tag next
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -62,13 +68,3 @@ jobs:
               description: package.version,
               target_url: `https://unpkg.com/${package.name}@${package.version}/`
             })
-
-  release-candidate-next-major:
-    if: github.ref_name == 'changeset-release/next-major'
-    name: Candidate (@next-major)
-    uses: primer/.github/.github/workflows/[email protected]
-    with:
-      tag: next-major
-    secrets:
-      gh_token: ${{ secrets.GITHUB_TOKEN }}
-      npm_token: ${{ secrets.NPM_AUTH_TOKEN_SHARED }}