SK-3002 Fix release workflow: v3 branch/path ambiguity

[Devesh-Skyflow]

Problem

The release workflow (beta/public) failed in the Commit changes step:

fatal: 'v3' could be both a local file and a tracking branch.
Please use -- (and optionally --no-guess) to disambiguate
Error: Process completed with exit code 128.

Root cause: the step ran git checkout ${{ env.branch_name }} (i.e. git checkout v3). Because the repo now contains a v3/ directory (see the git add v3/pom.xml line right below), the argument v3 is ambiguous between the branch v3 and the path v3/, so git bails out.

Fix

Use git switch instead of git checkout in .github/workflows/shared-build-and-deploy.yml. git switch only ever operates on branches, so the branch/path collision cannot occur.

- git checkout ${{ env.branch_name }}
+ git switch ${{ env.branch_name }}

The git push origin ${{ env.branch_name }} lines are unaffected — push refspecs are not ambiguous with paths.

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