dgraph-io / dgraph / 5400190070

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fix(zero): fix zero's health endpoint to return json response (#8858)

Fixes #5517 Zero's /health endpoint just returns OK unlike Alpha's JSON
output.

## Problem
curl http://alpha-hostname:alpha-http-port/health returns a JSON output
whereas, curl http://zero-hostname:zero-http-port/health returns a plain
text "OK".

## Solution
Added code to return a plain text output ("OK") for the "text/plain" to
maintain the backward compatibility and return JSON output for "Accept:
application/json" header.

Example Output:
$ curl http://localhost:58696/health
OK

$ curl -H "Accept: application/json" http://localhost:58696/health

{"instance":"zero","address":"zero1:5080","status":"healthy","version":"v23.0.0-16-g90139243f","uptime":9223372036,"lastEcho":1686137664}

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