feat: use shallow clone in prepare and emit-build-metadata jobs

Neither job needs git history: prepare only reads config files and
emit-build-metadata only runs git rev-parse HEAD (always present
in shallow clones). Dropping fetch-depth: 0 switches to the
default depth-1 shallow clone, saving ~1 min of checkout time.

Ref: MCWP-574

Author: Qbandev

.github/workflows/build.yml

@@ -119,7 +119,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          fetch-depth: 0
           ref: ${{ !inputs.skip_version_bump && needs.update-build-version.outputs.commit-hash || (inputs.source_branch || github.ref_name) }}
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -519,7 +518,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          fetch-depth: 0
           ref: ${{ needs.prepare.outputs.checkout_ref_for_setup }}
 
       - name: Setup Node.js