Draft: Adding assign and unassign mutations for frameworks

What does this MR do and why?

Changed association of frameworks with projects

Changed association between projects and frameworks from has_one to has_many for supporting multiple frameworks for a project

Changelog: added EE: true

Mutations

For assigning framework(s)

mutation projectAssignComplianceFrameworks {
  projectAssignComplianceFrameworks(input: {projectId: "gid://gitlab/Project/24", 
    complianceFrameworkIds: ["gid://gitlab/ComplianceManagement::Framework/2"]}) {
    errors
    project {
     id
     name
    }
  }
}

For unassigning framework(s)

mutation projectUnassignComplianceFrameworks {
  projectUnassignComplianceFrameworks(input: {projectId: "gid://gitlab/Project/24", 
    complianceFrameworkIds: ["gid://gitlab/ComplianceManagement::Framework/2"]}) {
    errors
    project {
     id
     name
    }
  }
}

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Before	After

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Related to #464160 (closed)