GH-2745 Don't init default templates when unit testing (#2748)

* Don't warn when  appears in card followed by text that is not a username

* Selectively initalize default templates for unit tests that need them to reduce test times. Reduce log noise.

server/utils/debug.go

@@ -0,0 +1,20 @@
+package utils
+
+import (
+	"os"
+	"strings"
+)
+
+// IsRunningUnitTests returns true if this instance of FocalBoard is running unit or integration tests.
+func IsRunningUnitTests() bool {
+	testing := os.Getenv("FB_UNIT_TESTING")
+	if testing == "" {
+		return false
+	}
+
+	switch strings.ToLower(testing) {
+	case "1", "t", "y", "true", "yes":
+		return true
+	}
+	return false
+}