[filebeat]: improve debug logging in udp/tcp inputs

[aleksmaus]

Proposed commit message

Addressing the issue filebeat: improve debug logging in udp/tcp inputs

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Related issues

• Closes filebeat: improve debug logging in udp/tcp inputs #34060

Logs

Examples of added logs:

{"log.level":"debug","@timestamp":"2024-09-30T20:41:02.152-0400","log.logger":"input.tcp","log.origin":{"function":"github.com/elastic/beats/v7/filebeat/input/tcp.(*server).Run.func1","file.name":"tcp/input.go","file.line":112},"message":"Data received","service.name":"filebeat","id":"FEAD914EAB357583","host":"localhost:32001","bytes":7,"remote_address":"127.0.0.1:52756","truncated":false,"ecs.version":"1.6.0"}

{"log.level":"debug","@timestamp":"2024-09-30T20:42:39.869-0400","log.logger":"input.udp","log.origin":{"function":"github.com/elastic/beats/v7/filebeat/input/udp.(*server).Run.func1","file.name":"udp/input.go","file.line":102},"message":"Data received","service.name":"filebeat","id":"5CF62520E29C9FC3","host":"localhost:32001","bytes":8,"remote_address":"127.0.0.1:52667","truncated":false,"ecs.version":"1.6.0"}

{"log.level":"debug","@timestamp":"2024-09-30T20:45:22.175-0400","log.logger":"input.unix","log.origin":{"function":"github.com/elastic/beats/v7/filebeat/input/unix.(*server).Run.func1","file.name":"unix/input.go","file.line":105},"message":"Data received","service.name":"filebeat","id":"A41E47DC48C253F1","path":"/Users/pooh/filebeat.sock","bytes":7,"ecs.version":"1.6.0"}

[elasticmachine]

Pinging @elastic/sec-deployment-and-devices (Team:Security-Deployment and Devices)

[efd6]

Thanks

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)