Bug fix

When a multilineTextField component has multiple newlines, the rendering of that output in the summary list is wrong, e.g.

line 1

line 2

line 3

Is displayed as

line 1line2line 3

Ideally the rendered output in the summary list would exactly match the user's input, but marked does not seem to be able to output multiple newlines. Given this limitation and the space constraints of the summary list, I think it's ok to just collapse the newlines into one and render as if the input had been:

line 1
line 2
line 3

Which works fine.

Jira ticket: https://eaflood.atlassian.net/browse/TGC-842

(Description basically the same as above)

Type of change

• Bug fix
• New feature
• Breaking change
• Misc. (documentation, build updates, etc)

Checklist

• You have executed this code locally and it performs as expected.
• You have added tests to verify your code works.
• You have added code comments and JSDoc, where appropriate.
• There is no commented-out code.
• You have added developer docs in README.md and docs/* (where appropriate, e.g. new features).
• The tests are passing (npm run test).
• The linting checks are passing (npm run lint).
• The code has been formatted (npm run format).