Add test for casts for fluent-bit config

tests/upgrade_script/static/fluent_bit_casts.input.yaml

@@ -0,0 +1,9 @@
+fluent-bit:  
+  backend:
+    type: forward
+    forward:
+      host: ${CHART}.${NAMESPACE}.svc.cluster.local.
+      port: 24321
+      tls: "off"
+      tls_verify: "on"
+      tls_debug: 1

tests/upgrade_script/static/fluent_bit_casts.log

@@ -0,0 +1,7 @@
+[INFO]    Casting fluent-bit.backend.forward.tls to str
+[INFO]    Casting fluent-bit.backend.forward.tls_verify to str
+
+[INFO]    falco will be disabled. Change "falco.enabled" to "true" if you want to enable it
+
+Thank you for upgrading to v1.0.0 of the Sumo Logic Kubernetes Collection Helm chart.
+A new yaml file has been generated for you. Please check the current directory for new_values.yaml.

tests/upgrade_script/static/fluent_bit_casts.output.yaml

@@ -0,0 +1,9 @@
+fluent-bit:
+  backend:
+    type: forward
+    forward:
+      host: ${CHART}.${NAMESPACE}.svc.cluster.local.
+      port: 24321
+      tls: "off"
+      tls_verify: "on"
+      tls_debug: 1