Make VM name comparison case-insensitive in azure vm_backup_enabled check

[MalfuncEddie]

Context

FIX #10372

Description

This makes the vm comparison case insensitive

Steps to review

Please add a detailed description of how to review this PR.

Checklist

Community Checklist

• This feature/issue is listed in here or roadmap.prowler.com
• Is it assigned to me, if not, request it via the issue/feature in here or Prowler Community Slack

• Review if the code is being covered by tests.
• Review if code is being documented following this specification https://github.com/google/styleguide/blob/gh-pages/pyguide.md#38-comments-and-docstrings
• Review if backport is needed.
• Review if is needed to change the Readme.md
• Ensure new entries are added to CHANGELOG.md, if applicable.

SDK/CLI

• Are there new checks included in this PR? No
  • If so, do we need to update permissions for the provider? Please review this carefully.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

✅ Conflict Markers Resolved

All conflict markers have been successfully resolved in this pull request.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.12%. Comparing base (5a3475b) to head (ce98c1f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #10373       +/-   ##
===========================================
+ Coverage   56.85%   86.12%   +29.27%     
===========================================
  Files          87      223      +136     
  Lines        2846     5743     +2897     
===========================================
+ Hits         1618     4946     +3328     
+ Misses       1228      797      -431     

Flag	Coverage Δ
prowler-py3.10-azure	86.12% <ø> (?)
prowler-py3.10-oraclecloud	?
prowler-py3.11-azure	86.12% <ø> (?)
prowler-py3.11-oraclecloud	?
prowler-py3.12-azure	86.12% <ø> (?)
prowler-py3.12-oraclecloud	?
prowler-py3.9-azure	86.12% <ø> (?)
prowler-py3.9-oraclecloud	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
prowler	86.12% <ø> (+29.27%)	⬆️
api	∅ <ø> (∅)

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