Optional working preferences questions appear as mandatory on Apply

[warrensearle]

Describe the bug

It is now possible in Admin to configure working preferences questions as optional, however, on Apply, questions configured this way still appear to be mandatory.

Expected behaviour

Questions marked as optional in Admin should not be mandatory on Apply.

Screenshots

Admin. Configuring working preferences
Note the first question is optional

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Apply. Answering working preferences

Note the 'Save and continue' button is disabled. It should not be as the form has sufficient data entered (the first question is optional)

Additional context

The save button only becomes enabled when all questions have been answered. We need to ensure optional questions are excluded from this check.

[nickaddy]

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[drieJAC]

Do we need to preserve existing behaviour for version 1 Working Preferences questions?

[nickaddy]

@drieJAC I believe WP questions were mandatory for v1. As we haven't fully released v2, I'm not sure when or if there is a cut-off date for exercises using v1. It's possible there could be exercises in draft status that will be using v1, so I suppose, yes, we need to preserve existing behaviour for any exercises using v1.