Adding the SCOM insights workbook and removing the overview workbook

[ssachin872]

PR Checklist

• Explain your changes, so people looking at the PR know what and why, the code changes are the how.
  These changes are to add insights workbook for SCOM managed instance
• Validate your changes using one or more of the testing methods.
  Verified by uploading package to a storage blob

If adding or updating templates:

• post a screenshot of templates and/or gallery changes
  

Done

• ensure your template has a corresponding gallery entry in the gallery folder
  Done
• If you are adding a new template, add your team and template/gallery file(s) to the CODEOWNERS file. CODEOWNERS entries should be teams, not individuals
  Done
• ensure all steps have meaningful names
  Done
• ensure all parameters and grid columns have display names set so they can be localized
  Done
• ensure that parameters id values are unique or they will fail PR validation (parameter ids are used for localization)
  Done
• ensure that steps names are unique or they will fail PR validation (step names are used for localization)
  Done
• grep /subscription/ and ensure that your parameters don't have any hardcoded resourceIds or they will fail PR
  validation
  Done
• remove fallbackResourceIds and fromTemplateId fields from your template workbook or they will fail PR validation
  Done