Fixing lint errors and added kitchen-omnibus-chef gem to fix spec

[nikhil2611]

Description

This pull request updates the test dependencies in the Gemfile to address provisioner support and repository access issues. The main change is the temporary addition of the kitchen-omnibus-chef gem, with comments explaining the rationale and future plans.

Test dependency updates:

• Added the kitchen-omnibus-chef gem (version ~> 1.1) to provide chef-zero provisioner functionality, with comments noting its deprecated status and the plan to switch to kitchen-chef-enterprise once private repo access is available for public runners.

Related Issue

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (non-breaking change that does not add functionality or fix an issue)

Checklist:

• I have read the CONTRIBUTING document.
• I have run the pre-merge tests locally and they pass.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• If Gemfile.lock has changed, I have used --conservative to do it and included the full output in the Description above.
• All new and existing tests passed.
• All commits have been signed-off for the Developer Certificate of Origin.

[github-actions]

Simplecov Report

Covered	Threshold
98.51%	90%

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud