PR approval gating by multiple groups in S-CORE

Description:
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We need to analyze whether it is possible to enforce PR approval rules in S-CORE that require approvals from multiple groups before merging.

Context
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Currently, GitHub allows us to require a minimum number of reviewers for a PR. However, this does not ensure that approvals come from distinct groups/roles (e.g., architecture community, team leads, committers).

Example requirement:
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A merge into the feature section of S-CORE should require at least one approval from @team_a and two approvals from @team_b.

The rule must work as an AND conjunction not OR (i.e., at least one representative of both groups must approve).

Considerations
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- Must align with S-CORE governance roles (Committers vs Contributors).

- Integrate with existing CODEOWNERS rules if possible.

- Explore whether this can be achieved via:

- Native GitHub branch protection rules.

- A bot or GitHub Action that enforces multi-group approval.

- External tooling or custom automation.