OOC-4407: Update declaration & submit button

[masuk-kazi98]

Description

• Updated Declaration heading -> Now send your report
• Updated declaration content
• Removed declaration checkbox
• updated missing answers error
• updated submit button -> confirm and send

https://jira.collab.test-and-trace.nhs.uk/browse/OOC-4407

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Tested locally ✅

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation and versioning
• I have updated the architecture diagrams as per Contribute.md OR added an architectural decision record entry