[test] Promote fullcode variant to prepare clean up of superfluous test steps

Bug: v8:6408
Change-Id: I10a191561fbb1f0312b1c4270b21c393e8efe51c
Reviewed-on: https://chromium-review.googlesource.com/527075Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45766}

tools/run-tests.py

@@ -114,6 +114,7 @@ VARIANTS = ["default", "noturbofan"]
 MORE_VARIANTS = [
   "stress",
   "nooptimization",
+  "fullcode",
   "asm_wasm",
   "wasm_traps",
 ]
@@ -125,8 +126,9 @@ VARIANT_ALIASES = {
   "dev": VARIANTS,
   # Additional variants, run on all bots.
   "more": MORE_VARIANTS,
+  # TODO(machenbach): Deprecate this after the step is removed on infra side.
   # Additional variants, run on a subset of bots.
-  "extra": ["fullcode"],
+  "extra": [],
 }
 
 DEBUG_FLAGS = ["--nohard-abort", "--nodead-code-elimination",