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Limit number of external services per org/user

Administrator requested to merge mv/add-limit-to-external-services into main

Created by: miveronese

Ticket: https://sourcegraph.atlassian.net/browse/CLOUD-150

This PR adds, to the backend, on the Cloud mode, a limit to external services, allowing a max of 1 Github service + 1 Gitlab service per org/user.

As a result:

  • the API cannot be used to add more than 1 external_service of a given type
  • the API cannot be used to add external services that are not currently supported (only Github and Gitlab are currently supported)

Test plan

Unit tests

New unit tests have been added to cover the new checks. You can run them with go test ./cmd/frontend/graphqlbackend/. -v -run TestAddExternalService

Manual tests

Manual tests were done (see video) using the /api/console with the following mutation.

mutation AddExternalService($input: AddExternalServiceInput!) {
	addExternalService(input: $input) {
		kind,
    displayName,
    config,
  }
}

Query Variables:

{
  "input": {
    "kind": "Test",
    "displayName": "Test",
    "namespace": "Test",
    "config": "{\n  \"url\": \"https://test.com\",\n  \"token\": \"testest\",\n  \"projectQuery\": [\n    \"projects?membership=true&archived=no\"\n  ]\n}"
  }
}

https://user-images.githubusercontent.com/1552863/162556880-4cd634c5-30b8-4400-9e9b-554cf4f57aa9.mov

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