feat: allow to set automountServiceAccountToken at Pod level

[mloiseleur]

Description

This PR is based on #3575
It tries to follow @oliviassss suggestion

By default, it changes nothing.
When it is set, it will disable it at ServiceAccount level and set the true / false value on the pod template level.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mloiseleur
Once this PR has been reviewed and has the lgtm label, please assign kishorj for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[mloiseleur]

Please let me know if you prefer to comment out this value and/or to add it in the README.