Rewrite test userstory for WTO under admin

[musienko-maxim]

What does this PR do?

• This PR implements verification Web Terminal user story under an admin user

Screenshot/screencast of this PR

What issues does this PR fix or reference?

https://issues.redhat.com/browse/WTO-233

How to test this PR?

Prepare OpenShift infra with installed WebTerminal and run test:

MOCHA_DIRECTORY=web-terminal;
NODE_TLS_REJECT_UNAUTHORIZED=0;
OCP_INFRA=PSI;
OCP_VERSION=4.14;
RP_API_KEY=******;
RP_ENDPOINT=https://reportportal-wto.apps.ocp-c1.prod.psi.redhat.com/api/v1;
RP_IS_LOCAL_SERVER=false;
RP_PROJECT=wto;
SAVE_RP_REPORT_DATA=true;
TESTING_APPLICATION_NAME=wto;
TS_OCP_LOGIN_PAGE_PROVIDER_TITLE=htpasswd;
TS_SELENIUM_BASE_URL=https://devspaces.apps.ocp*****.com;
TS_SELENIUM_OCP_PASSWORD=****
TS_SELENIUM_OCP_USERNAME=*****;
TS_SELENIUM_VALUE_OPENSHIFT_OAUTH=true;
USERSTORY=WebTerminalUnderAdmin

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix or new feature
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[artaleks9]

On my opinion, looks good

[dmytro-ndp]

looks good to merge