Ability to customize pod label for sonobuoy plugin

[coderdjw]

Describe the solution you'd like [A clear and concise description of what you want to happen.]

Can the labels of sonobuoy plugin pod be customized by caller? We have some validation logic based on the labels.

Anything else you would like to add: [Miscellaneous information that will assist in solving the issue.]

Environment:

• Sonobuoy version: 0.57.3
• Kubernetes version: (use kubectl version): v1.32.2
• Kubernetes installer & version: v1.32.6
• Cloud provider or hardware configuration: AKS
• OS (e.g. from /etc/os-release): Windows