[prometheus-json-exporter] Fix scrapeTimeout validation #4916
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What this PR does / why we need it
The current implementation checks for the non-existent value
serviceMonitor.scrapeTimeoutwhich leads to a fallback to the default scrape timeout configured in Prometheus (usually 10s).The PR ensures that the configured scrapeTimeout value for a target is used or if not defined the default value is used.
Which issue this PR fixes
none
Special notes for your reviewer
Checklist
[prometheus-couchdb-exporter])