Implementation of correct output id, added example command for search on SPN name

[johnlokerse]

Overview/Summary

• Updated objectId to id as stated in issue objectid needs to be changed to id #275
• Added an example command to find the objectId via name

The role assignments module was the only place where I could find the command as stated in issue #275

This PR fixes/adds/changes/removes

1. Fixes to the example commands to find the objectId of an SPN
2. Added an example command to find the objectId via the name of SPN

Breaking Changes

None

Testing Evidence

Updated command evidence:

Added example evidence:

As part of this Pull Request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues
• (ALZ Bicep Core Team Only) Associated it with relevant ADO Items
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Performed testing and provided evidence.
• Updated one or more of the following tests (if required)
  • Unit
  • Linting
  • E2E (End-To-End)
  • ValidateAzCloud (Base validation in Azure Cloud)
  • ValidateMcCloud (Base validation in Azure China Cloud)
• Updated relevant and associated documentation (e.g. Contribution Guide, Module READMEs, Wiki Docs etc.)
• If relevant, created or updated Code Tours here

[jtracey93]

Thanks @johnlokerse