Bug 21305 – [CI] Cannot re-run Azure tests

Due to the fact we are shallow-cloning in Azure, tests cannot be re-run. ``` git checkout --progress --force 013eccaf113e6f23784c615d3ec66434c3629197 fatal: reference is not a tree: 013eccaf113e6f23784c615d3ec66434c3629197 ##[warning]Git checkout failed on shallow repository, this might because of git fetch with depth '1' doesn't include the checkout commit '013eccaf113e6f23784c615d3ec66434c3629197'. Please reference documentation (http://go.microsoft.com/fwlink/?LinkId=829603) ##[error]Git checkout failed with exit code: 128 ```

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