Explain why we have two script text converters

Define two script converters:

1) script - This is the original converter to evaluate scripts for successful responses.
2) miq_script - Define a duplicate but differently named script converter whose purpose is to
evaluate scripts for unsuccessful ajax responses.  jQuery 3.5.0 changed the behavior of the script
converter, replacing it with a no-op converter for scripts found in unsuccessful ajax responses.
Successful responses would continue to be evaluated as previously.
See: jquery/jquery@da3dd85

Due to this change starting in 3.5.0, we define a new type of script we can set as the dataType
so it's evaluated in the event of unsuccessful responses such as the SSO 401 unauthorized
issue we attempted to fix in #9410 and subsequently completed in #9426.

[skip ci]

Author: jrafanie

app/javascript/oldjs/jquery_overrides.js

@@ -24,6 +24,19 @@ jQuery.jsonPayload = function(text, fallback) {
 };
 
 $.ajaxSetup({
+  /* Define two script converters:
+
+  1) script - This is the original converter to evaluate scripts for successful responses.
+  2) miq_script - Define a duplicate but differently named script converter whose purpose is to
+  evaluate scripts for unsuccessful ajax responses.  jQuery 3.5.0 changed the behavior of the script
+  converter, replacing it with a no-op converter for scripts found in unsuccessful ajax responses.
+  Successful responses would continue to be evaluated as previously.
+  See: https://github.com/jquery/jquery/commit/da3dd85b63c4e3a6a768132c2a83a1a6eec24840
+
+  Due to this change starting in 3.5.0, we define a new type of script we can set as the dataType
+  so it's evaluated in the event of unsuccessful responses such as the SSO 401 unauthorized
+  issue we attempted to fix in #9410 and subsequently completed in #9426.
+  */
   accepts: {
     json: 'text/javascript, application/javascript, application/ecmascript, application/x-ecmascript',
   },