fix(a11y): DrawBoundary link to switch between map and upload should always be enabled

[jessicamcinchak]

Previously:

• We disabled the "Upload a location plan instead" and "Draw the boundary on a map instead" links to switch pages if the data on the respective page was fulfilled - meaning the user had to erase the boundary or remove their upload to switch pages back

Now:

• The links to switch pages are always enabled regardless of data
• Data is retained when switching pages
• handleSubmit() only submits the data from the page which the use "Continues" onwards from - ensuring the application payload has GeoJSON or an uploaded location plan, never both

Note:

• Enabling the link & updating the corresponding visuallyHidden text should fix the A-level issue described on page 17 (enabling by default also resolves a AA contrast issue)
• The overall "Continue" button on this component is still conditionally enabled (similar to FindProperty). As I understand, this is a usability-level issue only and we can address separately in a follow-up PR (see work started in fix(a11y): continue button should always be enabled on FindProperty & DrawBoundary #3022)

[github-actions]

Removed vultr server and associated DNS entries

[jessicamcinchak]

Sensory characteristics [A]

[ianjon3s]

Works exactly as expected.