Fix 9.1 Gitaly source update steps
What does this MR do?
Add a missing step in the optional 9.1 Gitaly source update.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Users could hit a situation where config.toml.example did not yet exist.
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together