Revert "[agentbeat] Fix agentbeat capabilities" (#40510)

* Revert "[agentbeat] Fix agentbeat capabilities (#40466)"

This reverts commit 36cef2f.

* Update main.go

(cherry picked from commit f6b8701)

CHANGELOG.next.asciidoc

@@ -11,6 +11,11 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 *Affecting all Beats*
 
 - Elevate effective capability set to match the Permitted set for agentbeat {pull}40466[40466]
+- Update Go version to 1.22.5. {pull}40082[40082]
+- Fix FQDN being lowercased when used as `host.hostname` {issue}39993[39993]
+- Beats won't log start up information when running under the Elastic Agent {40390}40390[40390]
+- Filebeat now needs `dup3`, `faccessat2`, `prctl` and `setrlimit` syscalls to run the journald input. If this input is not being used, the syscalls are not needed. All Beats have those syscalls allowed now because the default seccomp policy is global to all Beats. {pull}40061[40061]
+- Beats will rate limit the logs about errors when indexing events on Elasticsearch, logging a summary every 10s. The logs sent to the event log is unchanged. {issue}40157[40157]
 
 *Auditbeat*
 

x-pack/agentbeat/main.go

@@ -71,10 +71,6 @@ func prepareCommand(rootCmd *cmd.BeatsRootCmd) *cobra.Command {
 		if err != nil {
 			panic(fmt.Errorf("failed to set default config file path: %w", err))
 		}
-
-		// elevate Effective capabilities to match the Permitted set.
-		// required for unprivileged mode
-		initCapabilities()
 		return nil
 	}
 	return &rootCmd.Command