fix: remove rule, too many FPs and no better matching criteria

rules/windows/file_event/sysmon_uac_bypass_cleanmgr_tmpfile.yml

@@ -1,25 +0,0 @@
-title: UAC Bypass Using Cleanmgr Temp File Creation
-id: 6a8a8a65-15ac-4722-adb7-c93c213c180a
-description: Detects the pattern of UAC bypass using cleanmgr.exe to create temporary files (UACMe 63)
-author: Christian Burkard
-date: 2021/08/30
-status: experimental
-references:
-    - https://github.com/hfiref0x/UACME
-tags:
-    - attack.defense_evasion
-    - attack.privilege_escalation
-    - attack.t1548.002
-logsource:
-    category: file_event
-    product: windows
-detection:
-    selection:
-        Image: 'C:\Windows\system32\cleanmgr.exe'
-        TargetFilename|startswith: 'C:\Users\'
-        TargetFilename|contains: '\AppData\Local\Temp\'
-        TargetFilename|endswith: '.dll'
-    condition: selection
-falsepositives:
-    - Unknown
-level: high