Enable parameterized kubelet mount path during node-agent installation

[longxiucai]

Enables the parameterization of the kubelet mount path during node-agent installation

This PR enables the parameterization of the kubelet mount path during node-agent installation, allowing users to specify custom mount paths through configuration parameters. This addresses scenarios where different Kubernetes environments may use non-standard kubelet directories.

• This change introduces a new configuration parameter --kubelet-root-dir during node-agent installation.
• The default value remains unchanged to maintain backward compatibility.

Does your change fix a particular issue?

Fixes #(issue)

Please indicate you've done the following:

• 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

Attention: Patch coverage is 53.33333% with 7 lines in your changes missing coverage. Please review.

Project coverage is 60.05%. Comparing base (232bc90) to head (ab76f96).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/cmd/cli/install/install.go	0.00%	4 Missing ⚠️
pkg/install/resources.go	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9074      +/-   ##
==========================================
- Coverage   60.06%   60.05%   -0.01%     
==========================================
  Files         379      379              
  Lines       43483    43496      +13     
==========================================
+ Hits        26116    26122       +6     
- Misses      15801    15807       +6     
- Partials     1566     1567       +1     

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[kaovilai]

You may want to update docs/ to explain this.. but lgtm.

[longxiucai]

You may want to update docs/ to explain this.. but lgtm.

I've made the requested documentation updates and pushed a new commit with these changes to this PR.

[Lyndon-Li]

Many of the new dependencies are not related to the current change, please double check and add the necessary changes only.

[kaovilai]

~/git/velero nodeagent-kubelet-root-dir
❯ go mod why github.com/Microsoft/go-winio
# github.com/Microsoft/go-winio
github.com/vmware-tanzu/velero/pkg/install
k8s.io/kubernetes/pkg/kubelet/config
k8s.io/kubernetes/pkg/kubelet/types
k8s.io/cri-client/pkg/logs
k8s.io/cri-client/pkg
k8s.io/cri-client/pkg/util
github.com/Microsoft/go-winio

Came in via c49517b which imports k8s.io/kubernetes/pkg/kubelet/config to replace redeifning

-	hostPodsVolumePath := filepath.Join(c.kubeletRootDir, "pods")
-	hostPluginsVolumePath := filepath.Join(c.kubeletRootDir, "plugins")
+	hostPodsVolumePath := filepath.Join(c.kubeletRootDir, kubeletconfig.DefaultKubeletPodsDirName)
+	hostPluginsVolumePath := filepath.Join(c.kubeletRootDir, kubeletconfig.DefaultKubeletPluginsDirName)

[kaovilai]

which IIUC is @blackpiglet request

There appears to be no alternative k8s.io package that provides the same symbol. https://pkg.go.dev/search?q=DefaultKubeletPodsDirName&ref=opensearch

[kaovilai]

if we are not okay with the added imports, we might have to settle with the prior change.

[Lyndon-Li]

I think that is because kubelet is platform dependent.
My opinion is we always keep the code platform independent unless really necessary, so in comparison, copying the default rootDir strings to Velero is acceptable.

[kaovilai]

Maybe revert to ths commit then 2d1a8bc

[longxiucai]

Done. I've reverted commit c49517b while keeping 2d1a8bc