fix: add max query delay validation per data source

[mkaras-nobl9]

Motivation

Splunk Observability max query delay is <= 15 minutes, but it used default 24h for all data sources.

Summary

• validate Splunk Observability query delay is <= 15m
• any other not defined data source uses default 24 hours query delay as max value
• sort manifest/v1alpha/data_sources.go by functionality

Release Notes

Adds max query delay validation for Splunk Observability to 15 minutes.

[paulina-n9]

lgtm