Handle the case where committing in CI doesn't make sense

[Andy-Grigg]

The 'Generate Client Library' CI workflow expects to always commit the generated code, but there are situations where that doesn't make sense:

• Dependabot PRs - These generally shouldn't be making any changes to the code
• Running CI on main - We don't want to push directly to main

For the dependabot PRs, not bumping the version number in this case might be a good option, since then the happy case will be no changes to the code, and the commit won't happen.

For running CI on main, this might just be a check to not commit on main, or potentially if run on main to always create a separate branch and PR.