Closes #620: remove Thread.sleep from integration tests

[arolfes]

replace all Thread.sleep calls with better Awaitility.await

SonarCloud Results

Unfortunately I needed to create a class ordering for JUnit to execute at leaset the class pro.taskana.adapter.integration.TestDisabledTaskClaim at first. I din't figure out why this needs to be the case.

To check the tests for flakyness a created a test script mvnw_clean_install_20_times.sh I executed a complete ./mvnw clean install run 20 times and no errors occured. For details please check attachment
clean_install_results.txt.tar.gz for more details.

For the reviewers: please review the assert in the awaitibilty when a waiting is successful.

old execution time

new exection time

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Release Notes:

# Improvements:
* all integrationtests using Awaitility.wait which decreases the execution time over 2 minutes 

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