hwc: Pixel: Name event looper thread and add trace tag

Assigning a name to the event looper thread improves trace
interpretability.
Additionally, a trace tag is added to the frame insertion trace call to
ensure it is displayed correctly.

Bug: 381258754
Test: Verify the trace to ensure frame insertions are properly displayed

Change-Id: I15506a8423c659e41edbc6eff1a05599d24640eb