(activity): Activity creation changes

[brrkrmn]

Summary

This PR addresses the changes needed for the activity creation process. The prioritized tasks were functional needs so the new design is not yet implemented.

Closes #1097

Changes

1. Created activities are unpublished by default
2. Removed the 'preview' and 'draft' banner from activity creation form. The 'go back' arrow is also removed since it was not functional.
3. The label of the submit button in the last step is changed from 'publish' to 'create'
4. The modal that appears after the user creates an activity is edited:
   • Removed social buttons because the user should not be able to share the activity until it is published
   • Changed the texts to explain that the activity is created and in waitlist to be published.

Screenshots

[NdibeRaymond]

still needs rebasing right @brrkrmn ?

[github-actions[bot]]

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[github-actions[bot]]

pre-commit checks failed ❌❌❌ make sure you have pre-commit set up locally (see the README.md for instructions). If you have set up pre-commit locally, you may need to undo this commit and run "pre-commit" locally to see what the errors are.

[github-actions[bot]]

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[github-actions[bot]]

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[NdibeRaymond]

@tuxology this has been rebased so you can focus on testing before merging to staging.