[Fleet] Able to create agent policies from the add agent flyout for shared integration, which temporarily displays incorrect integrations for the selected policy

[sukhwindersingh-qasource]

Kibana Build details:

VERSION: 8.16.0 BUILD: 79197 COMMIT: 2601f8aa203cd733a7669a59398a185ed8af12c4

Preconditions:

• 8.16.0-SNAPSHOT Kibana cloud environment should be available.
• Shared Integration should be present for Defend

Steps to reproduce:

• Navigate to the Integrations policies page
• Click on the Add agent
• Now click on the create new policy
• Click on create policy
• Observe user is able to create agent policies from the add agent flyout for shared integration, which temporarily displays incorrect integrations for the selected policy

Expected Result: It should displays correct integrations for the selected policy

Screen cast:

https://github.com/user-attachments/assets/781b544a-1ca4-4784-989f-cf359864975b

Feature:

https://github.com/elastic/kibana/issues/75867

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[sukhwindersingh-qasource]

@amolnater-qasource Please review this

[amolnater-qasource]

Secondary Review for this ticket is Done.