[CAM-9643] Via Java API, I can delete the history of a single variable - camunda JIRA

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There is a method in history service to delete all historic data for a variable instance
The variable instance is identified by id
the method deletes from ACT_HI_VARINST and ACT_HI_DETAIL
Works the same for a running instance; if this variable is then set again after deletion, new history entries should be created and execution should not fail
Permission DELETE_HISTORY on resource PROCESS_DEFINITION is needed for historic variables of process instances
No permission is needed for historic variables of decision instances and standalone tasks

is depended on by

CAM-9550 As operator, I can delete the variable history of a process instance

CAM-9644 Via REST API, I can delete the history of a single variable

is related to

CAM-9646 Via Java API, I can delete all history entries for variables of one process instance