events: remove redundant todo

[gurgunday]

As said by the person who put the todo in the first place, it has been redundant for a while now

We have kWeakHandler: this now

PR removes it to prevent confusion

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.54%. Comparing base (b4b1413) to head (3673174).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #60595 +/- ## ========================================== - Coverage 88.56% 88.54% -0.03%  ========================================== Files 704 704 Lines 208077 208075 -2 Branches 40084 40077 -7 ========================================== - Hits 184289 184233 -56 - Misses 15826 15882 +56 + Partials 7962 7960 -2 

Files with missing lines	Coverage Δ
lib/internal/event_target.js	99.16% <ø> (-0.01%)	⬇️

... and 48 files with indirect coverage changes

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