[Cases] Create and Update cases with custom fields default values

[adcoelho]

See #171747 for more info.

Summary

Merging into a feature branch.

This PR handles only the UI in the Create and Update case pages.

Create case

• Custom fields where required: true will have their default values pre-filled.
• If the required custom field was created before this feature, the field will not be populated.

Update case

This is only relevant if required custom fields have no value and we navigate to the edit case page.

To reach this scenario do:

1. Create a text custom field where required: false
2. Create a case and leave that field empty
3. Change that custom field to required: true and define a default value
4. Go to the edit case page

How this is handled:

Demo video.

Screen.Recording.2024-01-18.at.17.37.39.mov

• If a single required custom field has no value:
  • No value is added is displayed.
  • When a user clicks the Edit button, the form is filled with the default value(when it exists).
  • The Save button will be enabled by default.
  • The help text This field was populated with the default value. is shown.
• When there are multiple required custom fields without a value, editing one will save the others with their default value

[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)

[elasticmachine]

Pinging @elastic/response-ops-cases (Feature:Cases)

[cnasikas]

Great work 🚀. I left some comments.

[js-jankisalvi]

Code looks good 👍 🎉

I found one bug regarding UI update:

• create Required Toggle customField with defaultValue: true
• Go to an existing case and update any other customField,
• you can see the user action saying that Required Toggle customField is set to true - but the switch is still off
• click Back to cases
• navigate back to case and can see the toggle switch is On now

CF.default.value.toggle.mov

[cnasikas]

Thank you for your patience with my comments!

[kibana-ci]

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To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @adcoelho