chore(format_query): Change response type to application/json
#9016
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What this PR does / why we need it:
Change is to be in consistent with other endpoints and also to the prometheus
format_query
format. https://prometheus.io/docs/prometheus/latest/querying/api/#formatting-query-expressionsWhich issue(s) this PR fixes:
Fixes #NA
Special notes for your reviewer:
requested by @gwdawson.
Related: grafana/grafana#64337
Checklist
CONTRIBUTING.md
guide (required)CHANGELOG.md
updateddocs/sources/upgrading/_index.md