Reland "Prerender2Desktop: Update field trial testing config"

This is a reland of commit b96c2dd0f4f11cb82413e382ffc3981ad91be517

This CL adds `EnabledPrerenderSpecRules` group for P2D experiment and
make experiment names up to date.

Original change's description:
> Prerender2Desktop: Update field trial testing config
>
> This CL modifies field trial testing config for P2D to enable only the
> feature Prerender2.
>
> Bug: 1332400
> Change-Id: Ief484fda4787080a2d52f66ba3654e7695528346
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3844463
> Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
> Commit-Queue: Ken Okada <kenoss@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1045831}

Bug: 1332400
Change-Id: I5320b7173160172ed279f8425ce3caed435a6e88
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3891562
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Commit-Queue: Ken Okada <kenoss@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1046255}
diff --git a/testing/variations/fieldtrial_testing_config.json b/testing/variations/fieldtrial_testing_config.json
index 25d8546..c3ee2376 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -7821,7 +7821,7 @@
             ],
             "experiments": [
                 {
-                    "name": "EnabledPrerenderSpecRulesAndDUI_20220804",
+                    "name": "EnabledPrerenderSpecRulesAndDUI_20220913",
                     "enable_features": [
                         "OmniboxTriggerForPrerender2",
                         "Prerender2"
@@ -7830,6 +7830,17 @@
                         "OmniboxTriggerForNoStatePrefetch",
                         "SupportSearchSuggestionForPrerender2"
                     ]
+                },
+                {
+                    "name": "EnabledPrerenderSpecRules_20220913",
+                    "enable_features": [
+                        "OmniboxTriggerForNoStatePrefetch",
+                        "Prerender2"
+                    ],
+                    "disable_features": [
+                        "OmniboxTriggerForPrerender2",
+                        "SupportSearchSuggestionForPrerender2"
+                    ]
                 }
             ]
         }