Use mocks for ApplicationSet Gitea, GitHub, and GitLab unit tests

[crenshaw-dev]

Summary

The Gitea unit tests for the PR and SCM generators currently make external API calls. This makes the tests flaky. We should instead use a mocked service.

https://github.com/argoproj/argo-cd/blob/master/applicationset/services/scm_provider/gitea_test.go
https://github.com/argoproj/argo-cd/blob/master/applicationset/services/pull_request/gitea_test.go

Motivation

Last week integration tests were broken for a couple days because of a change in the tested Gitea org.

Proposal

We could follow the model of the Bitbucket tests and use a mocked service.

argo-cd/applicationset/services/pull_request/bitbucket_server_test.go

Line 14 in 1d765a0

func defaultHandler(t *testing.T) func(http.ResponseWriter, *http.Request) {

[ashutosh16]

@crenshaw-dev Can you assign the issue to me? thx!

[rishabh625]

Lets include github and gitlab mock too with this issue
@ashutosh16 : I am raising PR for github and gitlab , i hopw u worked for gitea only

[rishabh625]

@crenshaw-dev : can u please assign to me as well, as github supports multiple asignee and edit title as well

[rishabh625]

@ashutosh16 : any update for gitea change?

[crenshaw-dev]

Reopened for gitea.