Split integration tests

[qsdigor]

After looking at how to improve large integrated tests which will fail at some time for flaky tests we thought about separating realtime and rest tests in CI. The current implementation runs both of them in one command. We can make them two jobs to better see which ones are failing (usually realtime). This will help us re-run the step which is failing rather than the whole test.

┆Issue is synchronized with this Jira Task by Unito

[sync-by-unito[bot]]

➤ Automation for Jira commented:

The link to the corresponding Jira issue is https://ably.atlassian.net/browse/SDK-3111