Added classes to Clocks prerequisites, as per issue 2985.

[BethanyG]

Closes #2985
Adjusts the prerequisites of the Clock exercise to add classes to them.

[github-actions]

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[BethanyG]

Note that PR #2989 has changes that will fix the Ci. That PR needs to be merged first, and then this can be rebased with the CI changes.

[BethanyG]

Closing this as it's easiest to start with a fresh branch due to the CI changes.