[Ubuntu] Add ssh_clear_authorized_keys to Packer template

[Alexey-Ayupov]

Description

This pull request introduces a new configuration option to the Ubuntu image build process, allowing control over whether SSH authorized keys are cleared during image creation.

Related issue:

Check list

• Related issue / work item is attached
• Tests are written (if applicable)
• Documentation is updated (if applicable)
• Changes are tested and related VM images are successfully generated

[Copilot]

Pull Request Overview

This PR adds a new configuration option ssh_clear_authorized_keys to the Ubuntu Packer template, allowing control over whether SSH authorized keys are cleared during image creation. The change provides flexibility in managing SSH access during the image build process.

• Added a new boolean variable ssh_clear_authorized_keys with a default value of true
• Configured the Azure ARM source to use this variable

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
images/ubuntu/templates/variable.ubuntu.pkr.hcl	Defines the new ssh_clear_authorized_keys boolean variable with default true
images/ubuntu/templates/source.ubuntu.pkr.hcl	Applies the variable to the Azure ARM source configuration

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