Add unit tests for submission creation

[wreality]

Problem/Why

src/pages/Submission.jest.spec does not assert anything regarding the submission form that exists on that page.

Goal/What

The create submission functionality is covered by the unit testing suite and the create submission form should be implemented as a child component.

Solution/How

Extract the create new submission form into a new component and write appropriate unit tests to ensure that the new submission functionality is tested,

To Do / Acceptance Criteria

• [ ] Extract form to new src/components/forms/UserCreateSubmissionForm.vue
• [ ] Write unit tests for UserCreateSubmissionForm
• [ ] Update SubmissionPage to use new component
• [ ] Update SubmissionPage.spec.jest.js to mock create submission mutation and assert results.

Review Checklist

• [ ] Jest tests pass
• [ ] Cypress Tests pass

[sattler9]

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