gh_report: include icon per test (#3980)

The top left column in test case includes most interesting action from
the row.

This allows quickly seeing flaky vs failing vs known failures.

Same logic in how we summarize env status with a single icon.

Example how it looks:
#3980 (comment)
Actual look:
#3961 (comment)

Author: denik

tools/gh_parse.py

@@ -520,9 +520,15 @@ def key(column):
     table = []
     for test_key, items in simplified_results.items():
         package_name, testname = test_key
+        status = "??"
+        for action in ACTIONS_WITH_ICON:
+            if action in items.values():
+                status = action[:2]
+                break
         items_proc = dict((k, short_action(v)) for (k, v) in items.items())
         table.append(
             {
+                " ": status,
                 "Test Name": testname,
                 **items_proc,
             }