Limit vulnerability management policy to 5 rules

What does this MR do and why?

Related #503841 (closed)

Limit vulnerability management policy to 5 rules

Limit the amount of rules that can be added for a vulnerability management policy to 5 and make sure the Add rule button gets hidden conditionally.

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Add rule button hidden when 5 rules are added

JSON schema validation when more than 5 rules are added

Backend validation error against JSON schema when you try to save with more than 5 rules

How to set up and validate locally

1. Enable vulnerability_management_policy feature flag at http://gdk.test:3000/rails/features
2. Go to any project
3. Go to Secure > Policies
4. Click New policy
5. Click Select policy on the Vulnerability management policy card
6. Add 5 conditions and validate that you can't add another condition in "rule" mode
7. Add another rule in the yaml mode, validate the JSON schema underlies the yaml and shows error on hovering