Auto merge of #12368 - MovingtoMars:task_name, r=KiChjang
Auto merge of #12368 - MovingtoMars:task_name, r=KiChjang

Implement Runnable trait name method for FireSimpleEventTask

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Implement Runnable trait name method for FireSimpleEventTask in `components/script/dom/htmlmediaelement.rs`.

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #12346

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- [ ] There are tests for these changes OR
- [x] These changes do not require tests because trivial change

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