Flaky test `TestMergeRequiredContextsCommitStatus`

[silverwind]

https://github.com/go-gitea/gitea/actions/runs/8199270074/job/22424432087

--- FAIL: TestMergeRequiredContextsCommitStatus (0.00s)
    commit_status_test.go:62: 
        	Error Trace:	/home/runner/work/gitea/gitea/services/pull/commit_status_test.go:62
        	Error:      	Test case failed
        	Test:       	TestMergeRequiredContextsCommitStatus
        	Messages:   	Test case 4 failed
FAIL

[yp05327]

This test is added in #29631
for case 4, CommitStatus are

{
    {Context: "Build 1", State: structs.CommitStatusSuccess},
    {Context: "Build 2", State: structs.CommitStatusSuccess},
    {Context: "Build 2t", State: structs.CommitStatusSuccess},
},

the rule is

{"Build*", "Build 2t*", "Build 3*"},

and why expected result is structs.CommitStatusPending, all of them are success 🤔

[charles7668]

This test is added in #29631 for case 4, CommitStatus are

{
    {Context: "Build 1", State: structs.CommitStatusSuccess},
    {Context: "Build 2", State: structs.CommitStatusSuccess},
    {Context: "Build 2t", State: structs.CommitStatusSuccess},
},

the rule is

{"Build*", "Build 2t*", "Build 3*"},

and why expected result is structs.CommitStatusPending, all of them are success 🤔

This is related to #29143. If a rule is added, then at least one matching action needs to exist.

discussion in #29631