Solve little flaws in BaseRuntime

[ndr-brt]

Feature Request

Currently there are two little flaws in the BaseRuntime that could be solved:

• the System.exit call has no reason to be and it's better to replace it with an extension throwing, that will help the caller to understand what happened. as a positive side effect this will also provide better output on the e2e tests when they fail for runtime issues (now they fall silently)
• the HealthCheckService is currently mandatory but this does not look like a good practice, because there could be the necessity to start a Runtime without that service, but now it causes an unavoidable exception.

Which Areas Would Be Affected?

boot

Why Is the Feature Desired?

Are there any requirements?

Solution Proposal

If possible, provide a (brief!) solution proposal.

[jimmarino]

Can we deal with the Healthcheck service after I split the boot services from the core services? The System.exit can be addressed independently.

[ndr-brt]

@jimmarino I already opened a PR, but it can wait, no problems