Propagate dns settings to backup pods

[flx5]

The dnsPolicy and dnsConfig field of the node-agent should be inherited. Otherwise a S3 server that is only available by using the indicated dns server will be unreachable in the upload pod.

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file (make new-changelog) or comment /kind changelog-not-required on this PR.
• Updated the corresponding documentation in site/content/docs/main.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.55%. Comparing base (8934b2c) to head (8aac1da).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8845      +/-   ##
==========================================
- Coverage   59.56%   59.55%   -0.02%     
==========================================
  Files         370      370              
  Lines       40239    40253      +14     
==========================================
+ Hits        23969    23972       +3     
- Misses      14771    14780       +9     
- Partials     1499     1501       +2     

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[kaovilai]

I've reviewed this change and it looks good. The approach to propagate DNS settings (dnsPolicy and dnsConfig) from the node agent pod to backup pods aligns well with Kubernetes best practices.

This will ensure consistent DNS resolution behavior between the node agent and the backup pods, which is critical when custom DNS settings are needed to reach storage endpoints like S3.

References from Kubernetes docs:

• https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-s-dns-policy
• https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-s-dns-config

LGTM 👍

[kaovilai]

#8887
Fixes issue introduced here + the common alias pr.