feat(secrets) Allow creating secrets with multiline values in the UI

[chriscollins3456]

Previously we had a regular input as the value field for secrets. Then we changed that to type "Password" so that the browser doesn't automatically remember the value (for security reasons). However we also want to allow mutliline secret values (like ssh keys) so the values field is now a textarea. Browsers don't automatically save textarea values like they do for inputs, so we will be good there security-wise. Just to be safe I put `autoComplete="false" to ensure the browser isn't saving this value.

On top of that I fixed a bug where after you save a secret and open up the modal again, the old values remained populated. We needed to be calling form.resetValues as well as resetting the state.

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[github-actions]

Unit Test Results (build & test)

597 tests  ±0   593 ✔️ ±0   11m 58s ⏱️ -1s
147 suites ±0       4 💤 ±0 
147 files   ±0       0 ❌ ±0 

Results for commit a235793. ± Comparison against base commit 95d1e01.