Disable nats test as we deprecate Fission Nats Integration (#2241)

We would like to deprecate Fission Nats Integration and recommend
user to use Fission Keda Nats connector to handle Keda events.

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

test/tests/mqtrigger/nats/test_mqtrigger.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+#test:disabled
 
 #
 # Create a function and trigger it using NATS

test/tests/mqtrigger/nats/test_mqtrigger_error.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+#test:disabled
 
 #
 # Create a function and trigger it using NATS