Add partially disabled mode for vulnerability policies

What does this MR do and why?

Add partially disabled mode

Partially disable rule section and action section when yaml is invalid

For vulnerability policy

References

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Description	UI
Before
Both rule and action are invalid
One section

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Go to Group/project
2. Secure -> Policies
3. New policy -> Vulnerability policy
4. Switch to yam mode, type wrong key in action or rule
5. Switch back to rule mode

Related to #511934 (closed)