Move the verification request from CampaignAssetsForm to AdaptiveForm

[eason9487]

Changes proposed in this Pull Request:

This is a pre-processing PR for #634 and for 📌 Display form validation errors in #1993.

To have a form state to determine whether to start showing validation errors to users, this PR:

• Add the relevant tests for the CampaignAssetsForm component first.
• Add basic tests for the AdaptiveForm component.
• Move the state and functions associated with the request verification from CampaignAssetsForm to AdaptiveForm.

Screenshots:

Kapture.2023-07-14.at.18.22.16.mp4

Detailed test instructions:

This PR only changes the code used in the campaign assets management.

1. Start creating a campaign and proceed to step 2.
2. Import a Final URL.
3. Click the "Save changes" button with invalid asset form data.
4. Check if the UI shows validation errors and also scroll page to the position of the first error.
5. Click the "Or, select a different Final URL" button to see if the UI hides all validation errors.
6. Repeat this test steps 3-5 again to see if the behavior of validation errors still works well.

Changelog entry

[ianlin]

Thanks for the tests and the refactoring. The error messages shown as expected, LGTM.