Removed "#Requires -Modules" from the PS scripts

[aporodnov]

Overview/Summary

The PowerShell scripts fail when trying to execute "#Requires" line in RunWorkflows.ps1 and EnvironmentContext.ps1 after the recent Az module update.

Additionally #Requires statement exists in other onboarding scripts like: scripts/configuration/Get-AlzConfiguration.ps1 scripts/configuration/New-AlzCredential.ps1 scripts/configuration/Remove-AlzCredential.ps1 scripts/configuration/New-AlzDeployment.ps1 scripts/configuration/New-AlzConfiguration.ps1 scripts/configuration/Test-AlzCredential.ps1

This change simply removes the statement from the scripts, since prerequisites are already installed for the script execution.

This PR fixes/adds/changes/removes

1. Fixed #392

Breaking Changes

1. N/A

Testing Evidence

Please provide any testing evidence to show that your Pull Request works/fixes as described and planned (include screenshots, if appropriate).

I tested the GitHub Actions after the #Requires statement removal in my own environment and GitHub actions were able to successfully execute the PowerShell scripts (tested with the "Management Groups" pipeline).

As part of this Pull Request I have

• [x] Checked for duplicate Pull Requests
• [x] Associated it with relevant GitHub Issues
• [x] Ensured my code/branch is up-to-date with the latest changes in the main branch
• [x] Performed testing and provided evidence.
• [x] Updated relevant and associated documentation.