refactor(group): remove AddGroupUsers handler + authz entry

[whoAbhishekSah]

SDK no longer uses AddGroupUsers (#1609) and the AddGroupUsers had become a thin loop over SetGroupMemberRole (#1608). Drops the handler, its test, the authz interceptor entry, and the now-unused proto types.

RemoveGroupUser stays — no replacement RPC.

Stacked on raystack/proton#488; PROTON_COMMIT will be re-pinned to the merge commit before this merges.

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Project	Deployment	Actions	Updated (UTC)
frontier	Ready	Preview, Comment	May 15, 2026 7:56am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: ca48e592-33a5-4e8f-b868-707a2fe7950a

📥 Commits

Reviewing files that changed from the base of the PR and between 5786739 and f357bb9.

⛔ Files ignored due to path filters (4)

• proto/v1beta1/admin.pb.go is excluded by !**/*.pb.go, !proto/**
• proto/v1beta1/frontier.pb.go is excluded by !**/*.pb.go, !proto/**
• proto/v1beta1/frontierv1beta1connect/frontier.connect.go is excluded by !proto/**
• proto/v1beta1/models.pb.go is excluded by !**/*.pb.go, !proto/**

📒 Files selected for processing (5)

• Makefile
• internal/api/v1beta1connect/group.go
• internal/api/v1beta1connect/group_test.go
• pkg/server/connect_interceptors/authorization.go
• test/e2e/regression/api_test.go

📝 Walkthrough

Walkthrough

This PR removes the AddGroupUsers RPC endpoint from the Frontier API and updates e2e tests to call SetGroupMemberRole instead. The Connect handler, authorization validation entry, and unit test are deleted. E2E regression tests now fetch the group member role during setup and use it when assigning group membership.

Changes

API Handler and Authorization Removal

Layer / File(s)	Summary
AddGroupUsers handler, authorization validation, and unit test removal internal/api/v1beta1connect/group.go, pkg/server/connect_interceptors/authorization.go, internal/api/v1beta1connect/group_test.go	The ConnectHandler.AddGroupUsers method is removed from the group handler; its authorization validation map entry is removed; and the comprehensive TestConnectHandler_AddGroupUsers table-driven test covering error and success paths is removed.

E2E Test Migration

Layer / File(s)	Summary
E2E test suite updates for SetGroupMemberRole test/e2e/regression/api_test.go	Test suite gains a groupMemberRole field; SetupSuite queries enabled roles in the group namespace to find and store the group member role ID; five test cases across group access, membership management, and user deletion scenarios replace AddGroupUsers calls with SetGroupMemberRole, providing GroupId, OrgId, PrincipalId, PrincipalType, and RoleId set to the stored group member role ID.

Build Tooling

Layer / File(s)	Summary
Proton archive version update Makefile	PROTON_COMMIT is updated to a new git revision, changing which Proton archive version the proto target downloads for protobuf generation.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• raystack/frontier#1608: This PR removes the AddGroupUsers handler and updates e2e tests to use SetGroupMemberRole, building directly on the prior migration of group user assignment behavior to the membership service.
• raystack/frontier#1609: The backend removal of AddGroupUsers and authorization updates align with the SDK UI layer refactoring from addGroupUsers to setGroupMemberRole.
• raystack/frontier#1436: Both PRs update Makefile PROTON_COMMIT to regenerate protobufs with a different Proton revision.

Suggested reviewers

• rohilsurana
• rsbh

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coveralls]

Coverage Report for CI Build 25907017306

Coverage decreased (-0.04%) to 42.232%

Details

• Coverage decreased (-0.04%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	37694
Covered Lines:	15919
Line Coverage:	42.23%
Coverage Strength:	11.87 hits per line

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💛 - Coveralls