disable (broken) smoke test for /ncov/global

Smoke testing works as intended when running locally, however it
is currently broken on GitHub Actions which causes confusion.
#1215 has been created
to fix this.

test/smoke-test/urls.txt

@@ -1,7 +1,9 @@
 # First token represents the path to access, remaining tokens are a
 # comma separated list of text assertions (text we expect to find in the
 # rendered page):
-/ncov/global, novel coronavirus, Phylogeny, Diversity, Filter by Location
+
+# Following smoke test passed locally, but failed stochastically on GitHub Actions
+#/ncov/global, novel coronavirus, Phylogeny, Diversity, Filter by Location
 
 /zika, Zika virus evolution, rectangular
 /zika?c=region&l=clock&legend=open&m=div&r=region, Zika virus evolution, rectangular