[chore] remove deprecated components (open-telemetry#152)

The fluentbit extension and prometheusexec receiver were marked as deprecated more than 2 months ago. Removing these components from the contrib distribution.

distributions/otelcol-contrib/manifest.yaml

@@ -15,7 +15,6 @@ extensions:
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/awsproxy v0.53.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/basicauthextension v0.53.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/bearertokenauthextension v0.53.0
-  - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/fluentbitextension v0.53.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/healthcheckextension v0.53.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/httpforwarder v0.53.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/oauth2clientauthextension v0.53.0
@@ -136,7 +135,6 @@ receivers:
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/opencensusreceiver v0.53.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/podmanreceiver v0.53.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/postgresqlreceiver v0.53.0
-  - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/prometheusexecreceiver v0.53.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/prometheusreceiver v0.53.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/rabbitmqreceiver v0.53.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/receiver/receivercreator v0.53.0