Remove deprecated plugins for v1.30.0

[srebhan]

Use Case

Remove deprecated plugins that are replaced by newer ones since some time.

related to #13351

Expected behavior

Plugins should be removed. If possible a way to migrate configs containing those plugins should be provided.

Actual behavior

Plugins there.

Additional info

The following plugins are affected

• inputs.cassandra replaced by inputs.inputs.jolokia2
  feat(config): Add framework for migrating deprecated plugins #13377
  chore(inputs.cassandra)!: Remove deprecated plugin #14859
• inputs.httpjson replaced by inputs.http
  feat(migrations): Add migration for 'inputs.httpjson' #13532
  chore(inputs.httpjson)!: Remove deprecated plugin #14860
• inputs.io replaced by inputs.diskio
  feat(migrations): Add migration for 'inputs.io' #13536
  chore(inputs.io)!: Remove deprecated plugin #14861
• inputs.jolokia replaced by inputs.jolokia2
  feat(migrations): Add migration for inputs.jolokia #14114
  chore(inputs.jolokia)!: Remove deprecated plugin #14862
• inputs.kafka_consumer_legacy replaced by inputs.kafka_consumer
  feat(migrations): Add migration for inputs.kafka_consumer_legacy #14122
  Note: This plugin requires manual migration!
  chore(inputs.kafka_consumer_legacy)!: Remove deprecated plugin #14863
• inputs.snmp_legacy replaced by inputs.snmp
  feat(migrations): Add migration for inputs.snmp_legacy #14123
  Note: This plugin requires manual migration!
  chore(inputs.snmp_legacy)!: Remove deprecated plugin #14864
• inputs.tcp_listener replaced by inputs.socket_listener
  feat(migrations): Add migration for inputs.tcp_listener #14119
  chore(inputs.tcp_listener)!: Remove deprecated plugin #14865
• inputs.udp_listener replaced by inputs.socket_listener
  feat(migrations): Add migration for inputs.udp_listener #14120
  chore(inputs.udp_listener)!: Remove deprecated plugin #14866
• outputs.riemann_legacy replaced by outputs.riemann
  feat(migrations): Add migration for outputs.riemann_legacy #14121
  chore(outputs.riemann_legacy)!: Remove deprecated plugin #14867

[powersj]

Next steps: as v1.30 will be in March 2024, then after new years 2024, circle around to this and removes these

[Hipska]

Maybe a good idea to start working with GitHub milestones again for these kind of tasks?