usockets: wait for the TLS spill at the HTTP close gates; drain a large https response after peer FIN - #35109

The new `describe("https")` block was inserted between a pre-existing why-comment (lines 198–203, "A 'drain' listener that writes again … never a torn second write") and the test it documents (`it("res.write() from 'drain' after client FIN is not torn mid-write")`, now at line 279). Appending the "Same scenario over TLS" comment onto that block and putting ~70 lines of https tests after it makes the original comment read as documentation for the https block — which has no torn-second-write case 

The `halfClose` parameter on `halfCloseTlsRequestBodyBytes` is dead: all three `it.each` rows pass `true`, so the `else socket.write(request)` branch is never taken. Either drop the parameter/branch (the helper's name already implies half-close) or add the intended non-half-close row to the matrix.