Allow rendering custom fields by its name alternatively to the field keys

Description

$!issue.getCustomFieldValue(), #renderCustomFIeld() and other template scripting methods now take the custom field keys to render the values.

When migrating templates from one Jira to another, all custom field IDs must be updated. Allow the rendering of custom fields by their name.

Environment

None

Preliminary Test Cases

None

Assignee

Tibor Hegyi

Reporter

Tibor Hegyi

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Priority

Critical
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