Add InfoSec team members as Ironbank project maintainers (#199148)

Elastic's InfoSec organization has agreed to provide justifications to
Elastic's IronBank images. We are adding members of that org to Kibana's
hardening manifest, listing them as project maintainers.

This PR:
1/ Adds select members of the infosec organization
2/ Keeps a few members from Operations and Platform Security, in order
to monitor in an observational capacity
3/ Removes engineers who are no longer responsible for the upkeep on
this project.
4/ Reorganizes the maintainers list

(cherry picked from commit 896b9c0)

src/dev/build/tasks/os_packages/docker_generator/templates/ironbank/hardening_manifest.yaml

@@ -48,39 +48,47 @@ resources:
 
 # List of project maintainers
 maintainers:
+  # AppEx Operations Members
+  - email: '[email protected]'
+    name: 'Brad White'
+    username: 'brad.white'
+    cht_member: false
   - email: '[email protected]'
     name: 'Jonathan Budzenski'
     username: 'jbudz'
     cht_member: false
-  - email: '[email protected]'
-    name: 'Brad White'
-    username: 'brad.white'
+  # AppEx Platform Security Members
+  - email: '[email protected]'
+    name: 'Aleh Zasypkin'
+    username: 'azasypkin'
+    cht_member: false
+  - email: '[email protected]'
+    name: 'Larry Gregory'
+    username: 'legrego'
+    cht_member: false
+  # InfoSec Members
+  - email: '[email protected]'
+    name: 'Abby Zumstein'
+    username: 'azumstein'
+    cht_member: false
+  - email: '[email protected]'
+    name: 'Arsalan Khan'
+    username: 'khanarsalan'
+    cht_member: false
+  - email: '[email protected]'
+    name: 'Slava Zhomir'
+    username: 'slava-elastic'
+    cht_member: false
+  - email: '[email protected]'
+    name: 'Ryan Kam'
+    username: 'ryankam'
+    cht_member: false
+  - email: '[email protected]'
+    name: 'Saumya Shree'
+    username: 'shreesaumya'
     cht_member: false
+  # CHT Members
   - email: '[email protected]'
     name: 'Alexander Klepal'
     username: 'alexander.klepal'
-    cht_member: true
-  - cht_member: false
-    email: [email protected]
-    name: Larry Gregory
-    username: legrego
-  - cht_member: false
-    email: [email protected]
-    name: Aleh Zasypkin
-    username: azasypkin
-  - cht_member: false
-    email: [email protected]
-    name: Kurt Greiner
-    username: kc13greiner
-  - cht_member: false
-    email: [email protected]
-    name: Jeramy Soucy
-    username: jeramysoucy
-  - cht_member: false
-    email: [email protected]
-    name: Sid Mantri
-    username: sidmantri
-  - cht_member: false
-    email: [email protected]
-    name: Elena Shostak
-    username: elena.shostak
+    cht_member: true