Add pod priority class to helm chart and icon

[cablespaghetti]

Description

Add priorityClassName option for each deployment and add an icon to the Helm chart.

Motivation and Context

We have had some issues with pods getting preempted in the middle of running a test which causes a test failure. Setting a higher priority for pods should reduce the chance of this happening.

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)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[CLAassistant]

All committers have signed the CLA.

[diemol]

Could you please update your fork and also update the values in Chart.yaml?

[cablespaghetti]

Done 👍

[diemol]

Thank you, @cablespaghetti