Disable V8ConcurrentInlining for perf bots

This is a partial revert of
https://chromium-review.googlesource.com/c/chromium/src/+/2010843.
Since V8ConcurrentInlining is enabled in the Future variants, we want
it disabled by default to be able to tell the difference with the
enabled variant.

Bug: chromium:1031988, chromium:1044485
Change-Id: I8a353a565ec743e8577eebe9d4475469b0138abb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014934
Auto-Submit: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Brian White <bcwhite@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734506}

testing/variations/fieldtrial_testing_config.json

@@ -7430,14 +7430,14 @@
             ],
             "experiments": [
                 {
-                    "name": "Enabled",
-                    "enable_features": [
+                    "name": "Disabled",
+                    "disable_features": [
                         "V8ConcurrentInlining"
                     ]
                 },
                 {
-                    "name": "Disabled",
-                    "disable_features": [
+                    "name": "Enabled",
+                    "enable_features": [
                         "V8ConcurrentInlining"
                     ]
                 }