Add proxy support for FIO in VMs

[ddomingu]

Type of change

• Refactor
• [ X] New feature
• Bug fix
• Optimization
• Documentation Update

Description

Currently, when running FIO in VMs, we install software like Podman. In restricted environments, internet access may require a proxy. This update introduces a new parameter that allows setting a proxy environment variable, ensuring compatibility with such environments

Related Tickets & Documents

• Related Issue #
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Checklist before requesting a review

• [X ] I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.

Testing

• Please describe the System Under Test.
• Please provide detailed steps to perform tests related to this code change.
• How were the fix/results from this change verified? Please provide relevant screenshots or results.