[Agent] Failing unit test TestActionStore on Windows

[andrewkroh]

TestActionStore is consistently failing on Windows.

For example: https://beats-ci.elastic.co/blue/organizations/jenkins/Beats%2Fbeats/detail/7.x/31/pipeline/369

=== RUN   TestActionStore
=== RUN   TestActionStore/action_returns_empty_when_no_action_is_saved_on_disk
=== RUN   TestActionStore/will_discard_silently_unknown_action
=== RUN   TestActionStore/can_save_to_disk_known_action_type
    TestActionStore/can_save_to_disk_known_action_type: action_store_test.go:75: 
        	Error Trace:	action_store_test.go:75
        	            				action_store_test.go:29
        	Error:      	Received unexpected error:
        	            	could not replace target file C:\Users\JENKIN~1.PAC\AppData\Local\Temp\action-store166669957\config.yml: rename C:\Users\JENKIN~1.PAC\AppData\Local\Temp\action-store166669957\config.yml.tmp C:\Users\JENKIN~1.PAC\AppData\Local\Temp\action-store166669957\config.yml: Access is denied.
        	Test:       	TestActionStore/can_save_to_disk_known_action_type
=== RUN   TestActionStore/when_we_ACK_we_save_to_disk
    TestActionStore/when_we_ACK_we_save_to_disk: action_store_test.go:101: 
        	Error Trace:	action_store_test.go:101
        	            				action_store_test.go:29
        	Error:      	Received unexpected error:
        	            	could not replace target file C:\Users\JENKIN~1.PAC\AppData\Local\Temp\action-store041062432\config.yml: rename C:\Users\JENKIN~1.PAC\AppData\Local\Temp\action-store041062432\config.yml.tmp C:\Users\JENKIN~1.PAC\AppData\Local\Temp\action-store041062432\config.yml: Access is denied.
        	Test:       	TestActionStore/when_we_ACK_we_save_to_disk
--- FAIL: TestActionStore (0.04s)

[elasticmachine]

Pinging @elastic/ingest-management (Team:Ingest Management)

[ph]

going to temporary skip it and work on it.