Enhancement/Editable text on confirmation page

[adamdavies1]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change. Please also include any acceptance criteria if you have any.

• Create a way to edit the text and title on the confirmation page.
• Related issue

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce the testing if necessary.

Before PR's can be merged they will need to be tested by QA and approved where applicable. To flag the change to QA assign @XGovFormBuilder/qa as one of the reviewers.

• [ ] Create a new application. Click on the new menu item Edit Confirmation Text. Add new text to title and next steps. Preview the pages and when submitting on the summary page you should see your text

Checklist:

• [x] My changes do not introduce any new linting errors
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] New and existing unit tests pass locally with my changes
• [x] I have rebased onto main and there are no code conflicts
• [ ] I have checked deployments are working in all environments
• [x] I have updated the architecture diagrams as per Contribute.md