FRW-9914 Enable parallel test execution

[AntonShopin]

PR Description

• Ticket: https://spryker.atlassian.net/browse/FRW-9914
• Enabled robotframework UI parallel tests execution in CI within one run

Steps before you submit a PR

• Please add tests for the code you add if it's possible.
• Please check out our contribution guide: https://docs.spryker.com/docs/dg/dev/code-contribution-guide.html
• Add a contribution-license-agreement.txt file with the following content:
  I hereby agree to Spryker\'s Contribution License Agreement in https://github.com/spryker/robotframework-suite-tests/blob/HASH_OF_COMMIT_YOU_ARE_BASING_YOUR_BRANCH_FROM_MASTER_BRANCH/CONTRIBUTING.md.

This is a mandatory step to make sure you are aware of the license agreement and agree to it. HASH_OF_COMMIT_YOU_ARE_BASING_YOUR_BRANCH_FROM_MASTER_BRANCH is a hash of the commit you are basing your branch from the master branch. You can take it from commits list of master branch before you submit a PR.

Checklist

• I agree with the Code Contribution License Agreement in CONTRIBUTING.md