add helm index v1.16.0

[zhzhuang-zju]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Update helm index

Which issue(s) this PR fixes:

Part of #6949

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`Helm chart`: Added helm index for 1.16 release.

[gemini-code-assist]

Summary of Changes

Hello @zhzhuang-zju, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the Helm chart index to incorporate the latest v1.16.0 releases for both the karmada and karmada-operator charts. This ensures that users can access and deploy the newest versions of these components through Helm, facilitating easier management and deployment within Kubernetes environments.

Highlights

• Helm Chart Update: New entries for the karmada Helm chart version v1.16.0 have been added to the charts/index.yaml file.
• Karmada Operator Chart: A new entry for the karmada-operator Helm chart version v1.16.0 has been included in the charts/index.yaml file.
• Index Timestamp: The generated timestamp within the charts/index.yaml file has been updated to reflect the latest changes.

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[gemini-code-assist]

Code Review

This pull request updates the Helm chart index to include the new v1.16.0 release for both karmada and karmada-operator charts. The changes are mostly correct and follow the established structure. However, I've found a minor inconsistency in the generated timestamps which might indicate a small issue in the release process. Please see my detailed comment.

[gemini-code-assist]

The created timestamp for this chart entry is slightly later than the generated timestamp at the end of the file (line 575). The generated timestamp should be greater than or equal to all created timestamps in the index. This minor discrepancy suggests a potential issue in the release process, like clock skew or command ordering. Ensuring the generated timestamp is always the latest will improve the index file's integrity.

[zhzhuang-zju]

The generated timestamp should be greater than or equal to all created timestamps in the index

Not exactly, and it was auto-generated by the command helm repo index.

[RainbowMango]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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

The pull request process is described here

Needs approval from an approver in each of these files:

• charts/OWNERS [RainbowMango]

Approvers can indicate their approval by writing /approve in a comment
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[zhzhuang-zju]

Sharing my prompt for using an agent to update the Helm index.

# Role

Professional Helm maintainer

# Task

After a new release, update the Helm chart index for `karmada` and `karmada-operator`.

# Context

The Helm index enables clients to discover and query charts in the repository, including version information, descriptions, and other metadata.

## Index path

`charts/index.yaml`

## karmada path

`charts/karmada`

## karmada-operator path

`charts/karmada-operator`

## Entries

Two entries: `karmada` and `karmada-operator`

# Instructions

Strictly follow the steps below to update the chart index:

1. Download the new version of the `karmada` chart package from the GitHub Karmada release assets using the URL:  
   `https://github.com/karmada-io/karmada/releases/download/{{version}}/karmada-chart-{{version}}.tgz`  
   Save it under the directory `charts/karmada/`.

2. Run:  
   helm repo index charts/karmada --url https://github.com/karmada-io/karmada/releases/download/{{version}} --merge charts/index.yaml

3. Run:  
   mv charts/karmada/index.yaml charts/index.yaml

4. Remove the auto-generated code block under the `entries.common` field in the updated `index.yaml`.

5. The above completes the index update for the `karmada` chart.

6. Repeat the same steps (1–4) to update the index for the `karmada-operator` chart.

7. cleanup: Removed the downloaded chart files to keep the workspace clean

# Note

Keep the indentation unchanged.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.60%. Comparing base (8bebb5d) to head (9398616).
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6990      +/-   ##
==========================================
- Coverage   46.61%   46.60%   -0.01%     
==========================================
  Files         699      699              
  Lines       48156    48156              
==========================================
- Hits        22447    22445       -2     
- Misses      24014    24016       +2     
  Partials     1695     1695              

Flag	Coverage Δ
unittests	46.60% <ø> (-0.01%)	⬇️

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