Form/YAML form errors stay around

Description of problem:

When you are in YAML portion of the Form/YAML view, you can cause a syntax error and get a form error (the error part of the footer). Navigating back to the Form view, it's just "there" and not at all clearable.

Prerequisites (if any, like setup, operators/versions):

None.

I will denote Pipeline Builder steps but I suspect this is with all Form/YAML switchers. So Pipeline Builder Operator is needed for the steps.

Steps to Reproduce (for the Pipeline Builder)

1. Navigate to the Pipeline Builder
2. Go to the YAML and make an invalid syntax
3. Save (should error out)
4. Return to the Form view

Actual results:

The error is still visible and blocking a portion of the screen without really having validity to what the user is looking at.

Expected results:

When the user switches to Form we should clear the error.

Reproducibility (Always/Intermittent/Only Once):

Always

Build Details:

4.8.0-0.nightly-2021-06-13-101614

Additional info:

Not sure there is standard UX for this...