Revert "[dumpling] Disable timestamp non-determinism."

This reverts commit 597241f.

Reason for revert: it didn't help with all timestamps, adding code prefix to mock date looks more promising. Additionally this flag does a bunch of other stuff and requires a build flag to work properly, so let's ditch it.

Original change's description:
> [dumpling] Disable timestamp non-determinism.
>
> Quoting Leszek: "--predictable basically disables any concurrency so
> that everything is scheduled on the main thread. --verify-predictable
> additionally adds a synthetic clock so that things like timestamps have
> a fixed value, for being able to verify predictability by hashing"
>
> Additionally --verify-predictable implies --predictable.
>
> Bug: 441467877
> Change-Id: I7c47d00b8de8242f4b029e60fe79816713756a2f
> Reviewed-on: https://chrome-internal-review.googlesource.com/c/v8/fuzzilli/+/9012917
> Reviewed-by: Dominik Klemba <tacet@google.com>
> Commit-Queue: Danylo Mocherniuk <mdanylo@google.com>

Bug: 441467877
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I8ed49d648aa34a7c75f1ebb220d52a16ee396259
Reviewed-on: https://chrome-internal-review.googlesource.com/c/v8/fuzzilli/+/9014817
Commit-Queue: Danylo Mocherniuk <mdanylo@google.com>
Reviewed-by: Danylo Mocherniuk <mdanylo@google.com>
Reviewed-by: Michael Achenbach <machenbach@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>

Author: danylo1999

Sources/FuzzilliCli/Profiles/V8DumplingProfile.swift

@@ -28,7 +28,7 @@ let v8DumplingProfile = Profile(
             "--experimental-fuzzing",
             "--js-staging",
             "--expose-fast-api",
-            "--verify-predictable",
+            "--predictable",
             "--no-sparkplug",
             "--maglev-dumping",
             "--turbofan-dumping",
@@ -56,7 +56,7 @@ let v8DumplingProfile = Profile(
         "--experimental-fuzzing",
         "--js-staging",
         "--expose-fast-api",
-        "--verify-predictable"
+        "--predictable"
     ],
 
     processEnv: [:],