[test] Skip some tests on the coverage bot.

test/mjsunit/mjsunit.status

Index: test/mjsunit/mjsunit.status
diff --git a/test/mjsunit/mjsunit.status b/test/mjsunit/mjsunit.status
index 21a9af8f3815b9446e7cfe7a68f2c1120dcd154d..e0c50f073ed95e0c316b871e12c283df9b0082a1 100644
--- a/test/mjsunit/mjsunit.status
+++ b/test/mjsunit/mjsunit.status
@@ -1065,4 +1065,12 @@
   'unicodelctest-no-optimization': [SKIP],
 }],  # ignition == True and (arch == arm or arch == arm64)
 
+##############################################################################
+['gcov_coverage', {
+  # Tests taking too long.
+  'array-functions-prototype-misc': [SKIP],
+  'strong/implicit-conversions': [SKIP],
+  'strong/load-element-mutate-backing-store': [SKIP],
+}],  # 'gcov_coverage'
+
 ]