Control logging and metrics independently

[akash1810]

The DISABLE_LOGGING_AND_METRICS environment variable is used in two places:

1. Configuring Log4JS

   dotcom-rendering/dotcom-rendering/src/server/lib/logging.ts

   Lines 132 to 136 in f73f19c

   	if (process.env.DISABLE_LOGGING_AND_METRICS === 'true') {
   	configure(disableLog4js);
   	} else {
   	configure(enableLog4js);
   	}

2. Publishing application level CloudWatch Metrics

   dotcom-rendering/dotcom-rendering/src/server/server.prod.ts

   Lines 100 to 104 in f73f19c

   	if (process.env.DISABLE_LOGGING_AND_METRICS !== 'true') {
   	setInterval(() => {
   	recordBaselineCloudWatchMetrics();
   	}, 10 * 1000);
   	}

When run in a container (see #16234) it is more standard to log to stdout/stderr and then have a sidecar container process the logs. Therefore, Log4JS is not needed.

When running in a container, we still want to produce application metrics. Can we separate this environment variable in two to enable/disable logging and metrics independently?