[FE] Conditionally show all projects in linked groups

Why are we doing this work

• It would be likely for a customer who manages across multiple top level groups to want to elevate the security group they are using to CSP. They would likely use all projects in the linked groups
• We should retain this dropdown option only in the case it was already selected in the group that is elevated to CSP

Relevant links

Non-functional requirements

• Documentation:
• Feature flag:
• Performance:
• Testing:

Implementation plan

• frontend update CSP scope options to only include ALL_PROJECTS_IN_LINKED_GROUPS if the yaml already has scope: { groups: {...} }

Verification steps