feat: Adding 'Show Answer' setting argument passing support in XBlock

[abodacs]

Problem

The global setting for the Show Answer button is not working for the d&dv2 block;

Fix

Adding 'Show Answer' setting argument passing support in XBlock

This is a part of xblock-drag-and-drop-v2 #294

       json_init_args = frag.json_init_args
        if hasattr(block, "showanswer"):
            json_init_args["showanswer"] = block.showanswer
        template_context['js_init_parameters'] = json_init_args

Testing instructions

• creating a new course or using Demo Course created by devstack.
• go to "Settings" -> "Advanced Settings" in the studio and search for "Show Answer" and set it to "finished".
• Enabling Drag and Drop in Studio
• Go to Studio UI and create a new unit
• Select Problem > Advanced > Drag and Drop, to create a v2 drag and drop XBlock
• Click Edit and change mode to Assessment
• Click Continue twice and Save
• Click on View Live Version
• "showanswer" with value "finished" will be added to the problem init_parameters

Deadline

"None" if there's no rush, or provide a specific date or event (and reason) if there is one.

Other information

Include anything else that will help reviewers and consumers understand the change.

• Current PR should unblock https://github.com/openedx/xblock-drag-and-drop-v2/pull/294

[openedx-webhooks]

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[natabene]

@abodacs Thank you for the contribution. Once you CLA has been finalized, we will be able to review.

[natabene]

@abodacs Thanks for sorting out the CLA agreement.

[nedbat]

📣 💥 Heads-up: You must either rebase onto master or merge master into your branch to keep passing required checks.

We added a new required check, "Tests Successful," that this PR does not yet run. Rebasing will get it started.

If you have any questions, please reach out to the Architecture team (either #architecture on Open edX Slack or #external-architecture on edX internal Slack).

[mphilbrick211]

Hi @abodacs! Are you planning to pursue this PR? If so, looks like you will need to rebase (per the comment above), and re-run the failing test(s). Thank you!

[abodacs]

I don't think we need this PR as @Agrendalath showed me how to pass an argument in XBlock

Thanks @mphilbrick211 You are free to close this PR

[Agrendalath]

Thanks for the ping, @abodacs - I wasn't aware of this PR. We can close it.

cc: @mphilbrick211

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