unsupported scheme for env config issue

[prashant-shahi]

Command used to run the collector with config in the env: ./signoz-collector --config=env:SIGNOZ_CONFIG_CONTENT

Previously tested to work in the signoz-otel-collector version: 0.79.7

Error log:

{"level":"fatal","timestamp":"2023-11-02T16:22:49.902Z","caller":"signozcollector/main.go:78","msg":"failed to run service:","error":"failed to start collector service: failed to start : unsupported scheme on URI \"env:SIGNOZ_CONFIG_CONTENT\"","stacktrace":"main.main\n\t/home/runner/work/signoz-otel-collector/signoz-otel-collector/cmd/signozcollector/main.go:78\nruntime.main\n\t/opt/hostedtoolcache/go/1.20.10/x64/src/runtime/proc.go:250"}

cc @srikanthccv @nityanandagohain @rkssisodiya