Allow clearing the complete content of a Multiple lines of text field in Append mode

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Currently, when using the Change value of single field action on a Multiple lines of text field with Append mode enabled, setting the value to EMPTY does not remove the existing appended entries.

This makes it impossible to reset such a field using standard WEBCON actions.

It would be useful to add an additional option to the Change value of single field action when the target field is a Multiple lines of text field with Append mode enabled, for example:

☐ Clear complete content including append history

When enabled, the action should remove all existing entries of the field, including the entries previously created by Append mode.

A typical use case is a technical/work log which should contain the entries from the current processing run only. Append mode would otherwise be ideal for such logs because it automatically stores the timestamp and author of every entry.

Currently, the workaround is to use a Multiple lines of text field without Append mode, clear it before processing, and manually concatenate every new log entry.