feat(ui) Allow a user to type in a custom value in ingestion Secret Fields

[chriscollins3456]

Now allow users to type whatever text they want in secret field while still being able to select from a list of existing secrets and create a secret on the fly.

Do this by changing the input type from Select to AutoComplete with the secrets as options to select and filter down from (if you start typing). If you don't select anything from the dropdown, we store whatever it is that you're typing as your value then.

Things still look the same.

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)

599 tests  ±0   595 ✔️ ±0   11m 54s ⏱️ +14s
149 suites ±0       4 💤 ±0 
149 files   ±0       0 ❌ ±0 

Results for commit 3e29231. ± Comparison against base commit 7b2a76d.

♻️ This comment has been updated with latest results.

[jjoyce0510]

LGTM once the build is green. I see it's a test.