feat: add exclude config option for excluding host log files

[obs-gh-mattcotter]

Description

OB-40414 Add exclude config option for excluding host log files.

Excerpt from observe-agent config:

# $ cat /usr/local/observe-agent/observe-agent.yaml 
# ...
host_monitoring:
  enabled: true
  logs:
    enabled: true
    exclude: [asdf.txt]

# $ observe-agent config
# ...
# ======== config file /var/folders/y8/v7cyk9611qbg059c0q02vk0w0000gn/T/observe-agent1962015451/2697844591-logs.yaml
receivers:
  filelog/host_monitoring:
    include:
      - /var/log/**/*.log
    exclude:
      - asdf.txt
    include_file_path: true
    storage: file_storage
    retry_on_failure:
      enabled: true
    max_log_size: 4MiB
    operators:
      - type: filter
        expr: 'body matches "otel-contrib"'

Checklist

• Created tests which fail without the change (if possible)
• Extended the README / documentation, if necessary