[Rule Tuning] Ensure host information is in endpoint rule queries (#2593)

* add unit tests to ensure host type and platform are included
* add host.os.name 'linux' to all linux rules
* add host.os.name macos to mac rules
* add host.os.name to windows rules; fix linux dates
* update from host.os.name to host.os.type

Co-authored-by: brokensound77 <brokensound77@users.noreply.github.com>
Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>

rules/windows/initial_access_script_executing_powershell.toml

@@ -4,7 +4,7 @@ integration = ["endpoint", "windows"]
 maturity = "production"
 min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 min_stack_version = "8.3.0"
-updated_date = "2022/12/14"
+updated_date = "2023/02/22"
 
 [rule]
 author = ["Elastic"]
@@ -79,7 +79,7 @@ timestamp_override = "event.ingested"
 type = "eql"
 
 query = '''
-process where event.type == "start" and
+process where host.os.type == "windows" and event.type == "start" and
   process.parent.name : ("cscript.exe", "wscript.exe") and process.name : "powershell.exe"
 '''