linter: no-unreachable should label the unreachable point

[Boshen]

It would be nice to show all the return points, the following message span is not helpful at a glance:

 × eslint(no-unreachable): Unreachable code.
    ╭─[kibana/x-pack/test/functional/services/uptime/navigation.ts:66:9]
 65 │             });
 66 │ ╭─▶         await testSubjects.existOrFail('uptimeMonitorPage', {
 67 │ │             timeout: 30000,
 68 │ ╰─▶         });
 69 │           }
    ╰────