feat(azure/vm): add new check vm_jit_access_enabled

[puchy22]

Context

This PR introduces a new Azure security check: vm_jit_access_enabled.
It ensures that all Microsoft Azure Virtual Machines are configured to use Just-in-Time (JIT) access, reducing the attack surface for management ports.

Implements the requirements from Trend Micro Conformity and follows Prowler's check development and test standards.

Description

• New check: vm_jit_access_enabled for Azure VMs, verifying JIT access is enabled.
• Service update: Extended Defender service to model and retrieve JIT policies using the Azure SDK.
• Unit tests: Comprehensive tests for all logic branches and edge cases, following Prowler conventions.
• Changelog: Updated with new check entry under the latest unreleased version.

Checklist

• Are there new checks included in this PR? Yes
  • If so, do we need to update permissions for the provider? No new permissions required; uses existing Defender/VM permissions.
• 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.

API

• Verify if API specs need to be regenerated.
• Check if version updates are required (e.g., specs, Poetry, etc.).
• Ensure new entries are added to CHANGELOG.md, if applicable.

License

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

[github-actions]

⚠️ Changes detected in the following folders without a corresponding update to the CHANGELOG.md:

• prowler

Please add an entry to the corresponding CHANGELOG.md file to maintain a clear history of changes.

✅ All necessary CHANGELOG.md files have been updated. Great job! 🎉

[codecov]

Codecov Report

Attention: Patch coverage is 90.24390% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.37%. Comparing base (4477cec) to head (999a943).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8202      +/-   ##
==========================================
- Coverage   88.08%   81.37%   -6.72%     
==========================================
  Files         897      275     -622     
  Lines       27597     9759   -17838     
==========================================
- Hits        24309     7941   -16368     
+ Misses       3288     1818    -1470     

Flag	Coverage Δ
prowler	81.37% <90.24%> (-6.72%)	⬇️

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

Components	Coverage Δ
prowler	81.37% <90.24%> (-6.72%)	⬇️
api	∅ <ø> (∅)

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