feat: migrate OrgExport RPC to ConnectRPC server

[whoAbhishekSah]

Description

Migrate ExportOrganizations RPC to ConnectRPC.

Changes

• Refactor Session, Authentication and Authorization Interceptor to implement connect.Interceptor interface.

Testing

The endpoint has been tested to return CSV data in each stream response.

Additionally, this has been tested with grpcurl.

➜  frontier-test git:(main) ✗ grpcurl -v \
  -plaintext \
  -H "Cookie: sid=${COOKIE}" \
  -import-path ./googleapis \
  -import-path ./grpc-gateway \
  -import-path ./protoc-gen-validate \
  -import-path ../raystack/proton \
  -proto ../raystack/proton/raystack/frontier/v1beta1/Admin.proto \
  -d '{}' \
  localhost:8002 \
  raystack.frontier.v1beta1.AdminService/ExportOrganizations

Response

Resolved method descriptor:
// buf:lint:ignore RPC_RESPONSE_STANDARD_NAME
// buf:lint:ignore RPC_REQUEST_RESPONSE_UNIQUE
rpc ExportOrganizations ( .raystack.frontier.v1beta1.ExportOrganizationsRequest ) returns ( stream .google.api.HttpBody ) {
  option (.google.api.http) = { get: "/v1beta1/admin/organizations/export" };
  option (.grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
    tags: [ "Organization" ],
    summary: "Export organizations",
    description: "Export organization with demographic properties and billing plan details",
    produces: [ "text/csv" ]
  };
}

Request metadata to send:
cookie: sid=asdasdfsa

Response headers received:
content-type: application/grpc
date: Mon, 28 Jul 2025 08:28:17 GMT
grpc-accept-encoding: gzip

Response contents:
{
  "contentType": "text/csv",
  "data": "dsafas="
}

Response contents:
{
  "contentType": "text/csv",
  "data": "dsafas="
}

Response contents:
{
  "contentType": "text/csv",
  "data": "dsafas="
}

Response contents:
{
  "contentType": "text/csv",
  "data": "dsafas="
}

Response contents:
{
  "contentType": "text/csv",
  "data": "dsafas="
}

Response contents:
{
  "contentType": "text/csv",
  "data": "dsafas="
}

Response contents:
{
  "contentType": "text/csv",
  "data": "dsafas="
}

Response contents:
{
  "contentType": "text/csv",
  "data": "dsafas="
}

Response contents:
{
  "contentType": "text/csv",
  "data": "dsafas="
}

Response trailers received:
(empty)
Sent 1 request and received 9 responses

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Name	Status	Preview	Comments	Updated (UTC)
frontier	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 30, 2025 8:56am

[coveralls]

Pull Request Test Coverage Report for Build 16618028728

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 179 (0.0%) changed or added relevant lines in 5 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.1%) to 31.153%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/server/server.go	0	8	0.0%
internal/api/v1beta1connect/organization_billing.go	0	21	0.0%
pkg/server/connect_interceptors/authentication.go	0	36	0.0%
pkg/server/connect_interceptors/authorization.go	0	38	0.0%
pkg/server/connect_interceptors/session.go	0	76	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/server/connect_interceptors/authentication.go	2	0.0%
pkg/server/connect_interceptors/authorization.go	2	0.0%

Totals
Change from base Build 16491593990:	-0.1%
Covered Lines:	10073
Relevant Lines:	32334

---

💛 - Coveralls