Issue Summary

the componentsLeadByUser function in JQL still uses user_name as argument.
This is fine for most cases, but will fail if the display_name is different than the user_name

Steps to Reproduce

1. Have a user whose "user_name" is different than the "display_name". This can usually happen after an import from Server where the email address matches an existing AA ID
2. Add that user as a component lead
3. Perform a JQL:

   component in componentsleadbyuser(that_user)
   

Expected Results

The issues with that component will show as results

Actual Results

The JQL will throw an error:
"Function 'componentsleadbyuser' can not generate a list of components for user 'display_name'; the user does not exist.

Workaround

Provide the AAID (Atlassian Account User Id) as an argument to componentsLeadByUser() function instead of a user name. In order to learn what the AAID of particular user is, one may try building a JQL query in Advanced Mode for an assignee field, i.e. assignee = start_typing_user_name. User picker would pop up and the query would be completed with the selected user AAID, e.g. asignee = abcde-12345. Copy that AAID into the original component in componentsLeadByUser(abcde-12345) query.