Add condition to handle case when running RS locally

[basiliskus]

Add condition to handle case when running RS locally

Changed condition in EtorDomainRegistration to use MockRSEndpointClient only when REPORT_STREAM_URL_PREFIX is empty or null. Also making sure that the e2e tests script empties the variable since they need the endpoint mock

Issue

#649

Checklist

• I have added tests to cover my changes
• I have added logging where useful (with appropriate log level)
• I have added JavaDocs where required
• I have updated the documentation accordingly

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
92.3% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[saquino0827]

Nice work!