Remove EndpointProperties

`EndpointProperties` is a left over of the infrastructure in 1.x and is
no longer used. Besides the `endpoints.enabled` property is now
`endpoints.all.enabled`.

Closes gh-10016

Author: snicoll

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/EndpointProperties.java

@@ -1083,7 +1083,7 @@ content into your application; rather pick only the properties that you need.
 	# ----------------------------------------
 
 	# ENDPOINTS ({sc-spring-boot-actuator}/endpoint/AbstractEndpoint.{sc-ext}[AbstractEndpoint] subclasses)
-	endpoints.enabled=true # Enable endpoints.
+	endpoints.all.enabled=true # Enable all endpoints.
 	endpoints.auditevents.enabled= # Enable the endpoint.
 	endpoints.autoconfig.enabled= # Enable the endpoint.
 	endpoints.beans.enabled= # Enable the endpoint.

spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -208,12 +208,12 @@ NOTE: The prefix ‟`endpoints` + `.` + `name`” is used to uniquely identify t
 that is being configured.
 
 By default, all endpoints except for `shutdown` are enabled. If you prefer to
-specifically "`opt-in`" endpoint enablement you can use the `endpoints.enabled` property.
-For example, the following will disable _all_ endpoints except for `info`:
+specifically "`opt-in`" endpoint enablement you can use the `endpoints.all.enabled`
+property. For example, the following will disable _all_ endpoints except for `info`:
 
 [source,properties,indent=0]
 ----
-	endpoints.enabled=false
+	endpoints.all.enabled=false
 	endpoints.info.enabled=true
 ----