* Fixed alerting_api_integration/security_and_spaces tests failing if actions proxy set on for parallel process running using commands 'scripts/functional_tests_server' and 'scripts/functional_test_runner'
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* Fixed get port from range for Slack and webhook simulators, removed some test warnings
* Added check for listening proxy server
* changed logger to debug removed not useful error
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* changed proxy to dynamic target in a single place
* test retry
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* test with no cleanup
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* Added environment variable ALERTING_PROXY_PORT
* fixed type checks
* fixed clean up proxy server port