Timestamp was not found warning in Collector Pods while forwarding logs to Splunk in RHOCP 4

Issue

• Collector pod repeatedly logs timestamp related warnings for the splunk_hec_logs sink.

• The following warning messages appear in the collector pod logs when forwarding logs to a Splunk:

  YYYY-MM-DDTHH:MM:SS.XXXXXZ  WARN sink{component_kind="sink" component_id=output_splunk_aosqe component_type=splunk_hec_logs}: vector::internal_events::splunk_hec::sink: Timestamp was not found. Deferring to Splunk to set the timestamp. internal_log_rate_limit=true
  
  YYYY-MM-DDTHH:MM:SS.XXXXXZ  WARN sink{component_kind="sink" component_id=output_splunk_aosqe component_type=splunk_hec_logs}: vector::internal_events::splunk_hec::sink: Internal log [Timestamp was not found. Deferring to Splunk to set the timestamp.] is being suppressed to avoid flooding