Stabilize SWF vscode-extension failing integration tests

Summary
Some tests started to fail when using new version of vscode-extension-tester. The failures occur only in specific environments - for sure on QE Jenkins.
These tests fail:

• Serverless workflow editor - Diagram navigation tests: Select states
• Serverless workflow editor - autocompletion tests YAML files: Completes serverless workflow from an empty file and create Empty Serverless Workflow

Goal
Failing tests are fixed and all the tests run correctly on all the environments.