fix(ci): stop tracing a canceled job

What does this MR do and why?

glab ci trace never returns on a canceled job. The trace loop tests for the status cancelled, but the API reports this state as canceled:

if job.Status == "success" ||
	job.Status == "failed" ||
	job.Status == "cancelled" {
	return nil
}

The terminal check therefore never matches and the command keeps polling and re-streaming the trace until the user interrupts it.

The API client is explicit about the spelling:

// client-go/v2/types.go
Canceled BuildStateValue = "canceled"

internal/commands/ci/ciutils/utils.go was the only place in the repository using the two-L spelling. ci/delete, ci/status, ci/view, mr/merge and runner/jobs all already use canceled.

Test coverage

A when the job was canceled case in the existing TestTraceJob table. The mock expects exactly one GetJob call, so a loop that fails to terminate shows up as an unexpected extra call rather than hanging the suite.

Reverting only utils.go:

--- FAIL: TestTraceJob (0.00s)
    --- FAIL: TestTraceJob/when_the_job_was_canceled (0.00s)

With the fix, go test ./internal/commands/ci/ciutils/ is green.

Related issues

Closes #8416 (closed)