Release version v1.2.1

[sangli-pensando]

This pull request introduces version v1.2.1 of the network-operator-charts Helm chart, adding support for new images and updating chart metadata and dependencies. The main changes include registering new images, updating the chart index with the new version, and specifying associated dependencies and maintainers.

Helm chart version update and metadata:

• Added a new entry for network-operator-charts version v1.2.1 in index.yaml, including metadata such as description, keywords, maintainers, source links, and compatibility with Kubernetes >= 1.29.0-0.
• Updated the chart index generated timestamp to reflect the new version.

Dependencies and images:

• Defined new chart dependencies for node-feature-discovery, kmm, and multus in the index.yaml for the new version.
• Listed new container images for the controller, CNI plugins, and utils in the charts/network-operator-charts-v1.2.1_meta.yml file.## Motivation

Technical Details

Test Plan

Test Result

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/TheRock/blob/main/GOVERNANCE.md#pull-requests.

[sundar-pds]

lgtm

[yuva29]

LGTM, thanks!