[Fleet] Add availability information at the parameter/property level for new Fleet API settings

[vishaangelova]

When support is available for x-state at the parameter and property level, we will need to review and add the availability information for all new Fleet API settings.

This issue tracks PRs that add new settings to the Fleet APIs, so we can update the availability later.

• PR: [UII] Hide agentless agents and policies kibana#219175 (added in 9.1)
• PR: [Fleet] Allow to configure monitoring runtime in agent policy kibana#233345 (added in 9.2, 9.1.3)
• PR: [Fleet] Agent privilege level change UI kibana#237790 (added in 9.3)

(The list will be extended as we identify further PRs that add new parameters or properties to existing APIs)

[colleenmcginnis]

(The list will be extended as we identify further PRs that add new parameters or properties to existing APIs)

@vishaangelova is this something we can do now or are we waiting for other PRs?

[vishaangelova]

Sorry, @colleenmcginnis — I somehow missed your ping. In this issue, I thought to gather development PRs that make changes to property/parameters in Fleet APIs when any such changes come to our attention. We still cannot add information to the docs as to which version these properties/parameters are added in (~applies_to). We can only start working on this issue when the API docs support this functionality (we should monitor this for updates).