Unstable test_databaseContainer_removesAllData_whenShouldFlushOnStartIsTrue test

[laevandus]

🎯 Goal

• Fix test which had race between one instance deleting the local DB file and another instance reading it

☑️ Contributor Checklist

• I have signed the Stream CLA (required)
• This change should be manually QAed
• Changelog is updated with client-facing changes
• Changelog is updated with new localization keys
• New code is covered by unit tests
• Comparison screenshots added for visual changes
• Affected documentation updated (docusaurus, tutorial, CMS)

[sonarqubecloud]

Quality Gate passed

Issues
141 New issues
0 Accepted issues

Measures
0 Security Hotspots
84.1% Coverage on New Code
0.1% Duplication on New Code

See analysis details on SonarCloud