Set HTTP(S)_PROXY env variable with proxy-url prop from cluster#2504

dgolovin wants to merge 3 commits intoredhat-developer:mainredhat-developer/vscode-openshift-tools:mainfrom

dgolovin:i2468-proxy-url-config-supportdgolovin/vscode-openshift-tools:i2468-proxy-url-config-supportCopy head branch name to clipboard