Add compliance framework labels to group-level project list
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### Problem to solve
As shown by the screenshot below, compliance frameworks (custom or otherwise) are not displayed at the group-level list of projects. We should add them here, and anywhere else that they are missing.

### Proposal
With ~"group::compliance" focusing on compliance framework labels **which belong to namespaces/groups**, we should consider making it clear which frameworks a project has assigned to it at the group-level.
Add the compliance framework assigned to a project as a label.

_I attempted to quickly fix this, but realised it's a Vue application and so had no idea what to do!_ It'll require ~frontend engineering attention.
### Implementation plan
For future me: the projects listing is currently using HAML and we build the pill with the following:
```haml
# ee/app/views/compliance_management/compliance_framework/_compliance_framework_badge.html.haml
%span.badge.compliance-framework-pill.ml-2.has-tooltip{ style: "background-color: #{framework.color}", data: { container: 'body' }, title: framework.description }
= framework.name
```
~frontend - `1`
1. Update `ee/app/serializers/ee/group_child_entity.rb` to include the compliance framework details (name, description and color) if the group has a framework associated
2. Update tests for the entity
3. Update `app/assets/javascripts/groups/components/group_item.vue:163` to show the framework in pill form (with tooltip) if the group has a framework associated
- Use the shared `ComplianceFramework.vue` component which will be created in https://gitlab.com/gitlab-org/gitlab/-/issues/215051
4. Update tests for the group item
### Product Tier
~"GitLab Premium"
issue