feat: Introduce top level pod configuration value

[keelerm84]

The chart initially supported a few pod configuration options at the top level -- podAnnotations and podSecurityContext. Now that we want to support labels on the pod, we are moving the preferred configuration under a single pod values option. This new option supports

• pod.annotations :: Takes precedence over podAnnotations
• pod.labels
• pod.securityContext :: Takes precedence over podSecurityContext

The legacy configuration options will continue to be supported until the next major release.

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #195620: Create pods section in values file.