Prior to this commit, limiting the exposure to a specific
technology in `ConditionalOnAvailableEndpoint` would not have
any effect because all endpoints would be considered to be available
if the app was running on Cloud Foundry. This caused issues in cases
where beans were meant to be exposed only if the endpoint was actually
exposed.
This commit adds CLOUD_FOUNDRY to the `EndpointExposure`
enum. This allows `ConditionalOnAvailableEndpoint` to limit
by exposure even when the Cloud Foundry platform is active.
Fixes gh-29532
0597c6831e