Add //testing/merge_scripts to the analyze blacklist.

Bug: 950789
Change-Id: I7af3cd1abf47022f1d95b1b3b66a13bb9984b706
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1559461Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649293}

testing/buildbot/trybot_analyze_config.json

@@ -24,6 +24,7 @@
       "DEPS",
       "testing/buildbot/.*json",
       "testing/buildbot/.*pyl",
+      "testing/merge_scripts/.*",
       "testing/scripts/.*",
       "testing/test_env.py",
       "third_party/android_platform/development/scripts/.*",