Catch azure-cli-telemetry code change without bumping up the version

`azure-cli-telemetry` code is not changed a lot and when it's changed, we need to bump the version, otherwise the changes won't be published to pypi. This has happened for a few times (twice as far as I know), such as PR #14905 causing issue #14963. We should catch this as early as possible.

We already have code change detection in incremental tests, so we can add a task to detect if the version of `azure-cli-telemetry` is upgraded when there are changes in its code.