perf(ext/event): always set timeStamp to 0 (#20191)

```js
Deno.bench(function eventNew() {
  new Event("foo");
});
```

<b>main</b>
```
./target/release/deno bench event_bench.js
cpu: Apple M1 Max
runtime: deno 1.36.1 (aarch64-apple-darwin)

file:///Users/ib/dev/deno/event_bench.js
benchmark      time (avg)        iter/s             (min … max)       p75       p99      p995
--------------------------------------------------------------- -----------------------------
eventNew       36.43 ns/iter  27,451,874.9   (35.15 ns … 46.98 ns)  37.68 ns   40.7 ns  41.69 ns

```

<b>this PR</b>
```
./target/release/deno bench event_bench.js
cpu: Apple M1 Max
runtime: deno 1.36.1 (aarch64-apple-darwin)

file:///Users/ib/dev/deno/event_bench.js
benchmark      time (avg)        iter/s             (min … max)       p75       p99      p995
--------------------------------------------------------------- -----------------------------
eventNew       13.71 ns/iter  72,958,970.0   (12.85 ns … 31.79 ns)  15.11 ns  16.49 ns   17.5 ns

```

Towards #20167

0 files changed, 0 insertions, 0 deletions