[8.x] [Cloud Security] Remove `Add integration` button from agent policy details page when the agent policy `supports_agentless` (#202211)

[kibanamachine]

Backport

This will backport the following commits from main to 8.x:

• [Cloud Security] Remove `Add integration` button from agent policy details page when the agent policy `supports_agentless` (#202211)

Questions ?

Please refer to the Backport tool documentation

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)