[reclient] Add use_remoteexec=true to reclient mixin.

Add the use_remoteexec arg to the reclient mixin.  Set both use_rbe and
use_remoteexec while switch from one ot the other.

Bug: chromium:1252752
Change-Id: I415a849dbd27c4de23d6f9fcfde7c1beba8f5f7f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3188950Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Savigny <msavigny@google.com>
Cr-Commit-Position: refs/heads/main@{#77117}

infra/mb/mb_config.pyl

@@ -804,7 +804,7 @@
     },
 
     'reclient': {
-      'gn_args': 'use_rbe=true',
+      'gn_args': 'use_rbe=true use_remoteexec=true',
     },
 
     'release': {