out_calyptia: move debug payload to debug level.

[lecaros]

Moving the debug payload from info to debug level.

The output of this can result in half-way lines, which confuses the user.

Example 1

[2024/05/07 21:11:41] [ warn] [output:calyptia:calyptia.2] http_status=422:
{"error":"zero metric values"}
[2024/05/07 21:11:41] [error] [output:calyptia:calyptia.2] could not deliver metrics
[2024/05/07 21:11:41] [ info] [output:calyptia:calyptia.2] debug payload:
2024-05-07T21:11:40.221389762Z fluentbit_uptime{pipeline_id="xxx",hostname="yyy"} = 5
...
2024-05-07T21:11:35.674983168Z fluentbit_output_retries_failed_total{pipeline_id="xxx",name="stdout.1"} = 0
2024-05-07T21:11:35.674983168Z fluentbit_output_dropped_records_total{pipeline_id="xxx",name="stdout.1"} = 0
2024-05-07T21:11:35.674983168Z fluentbit_output_retried_records_total{pipeline_id="xxx",name="stdout.1"} = 0
2024-05-07T21:11:35.675263704Z fluentbit_output_proc_records_total{pipeline_id="xxx",name="calyptia.2"} = 0
2024-05-07T21:11:35.675263704Z fluentbit_output_proc_bytes_total{pipeline_id="xxx",name="calyptia.2"} = 0
2024-05-07T21:11:35.675263704Z fluentbit_output_errors_total{pipeline_id="xxx",name="calyptia

Example 2

[2024/05/04 15:40:23] [ warn] [output:calyptia:calyptia.1] http_status=422:
{"error":"zero metric values"}
[2024/05/04 15:40:23] [error] [output:calyptia:calyptia.1] could not deliver metrics
[2024/05/04 15:40:23] [ info] [output:calyptia:calyptia.1] debug payload:
...
2024-05-04T15:40:17.432402887Z fluentbit_output_retried_records_total{pipeline_id="yyy",name="calyptia.1"} = 0
2024-05-04T15:40:22.217258412Z fluentbit_process_start_time_seconds{pipeline_id="yyy",hostname="xxx"} = 1714837217
2024-05-04T15:40:22.217258412Z fluentbit_build_info{pipeline_id="yyy",hostname="xxx",,os="linux"} = 1714837217
2024-05-04T15:40:22.217258412Z fluent

This should only be printed if debug is enabled.

---

Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

[edsiper]

@pwhelan pls review

[pwhelan]

LGTM