Updated API & Sel tests for suspiscious powershell panel

[rishagg01]

🗣 Description

Added Test data (API Call) and modified Selenium Test for Suspicious PowerShell Panel on User Security Dashboard.

💭 Motivation and context

Selenium test for Suspicious PowerShell panel was being skipped because there was no data.

This change adds test data and uses new CSS locator to identify proper loading of the panel.

📷 Screenshots (DELETE IF UNAPPLICABLE)

🧪 Testing

All the API and Sel tests were executed and all passed.

✅ Pre-approval checklist

• [Y] Changes are limited to a single goal AND the title reflects this in a clear human readable format
• [Y] Issue that this PR solves has been selected in the Development section
• [Y] I have read and agree to LME's CONTRIBUTING.md document.
• [Y] The PR adheres to LME's requirements in RELEASES.md
• [Y] These code changes follow cisagov code standards.
• [Y] All relevant repo and/or project documentation has been updated to reflect the changes in this PR.

✅ Pre-merge Checklist

• [Y] All tests pass
• [Y] PR has been tested and the documentation for testing is above
• [Y] Squash and merge all commits into one PR level commit

✅ Post-merge Checklist

• [Y] Delete the branch to keep down number of branches