Add namespace to template helm chart

[tnqv]

What this PR does / why we need it:

• Unavailable helm install with "--namespace' option #789 namespace not affects when using helm chart because of TemplateLocalChart and TemplateRemoteChart have not set namespace yet.

Which issue(s) this PR fixes:

Fixes #789

Does this PR introduce a user-facing change?:

NONE

[nghialv]

Hi @tnqv .

A nice and well-tested pull request. Love it. Thank you.
I have just left a suggestion. 💯

[nghialv]

/trigger presubmits

[pipecd-bot]

@nghialv: Your requested presubmits has been scheduled in response to this comment.

[pipecd-bot]

Code coverage for golang is 32.95%. This pull request increases coverage by 0.04%.

File	Function	Base	Head	Diff
pkg/app/piped/cloudprovider/kubernetes/manifest.go	Manifest.GetNestedMap	--	75.00%	+75.00%
pkg/app/piped/cloudprovider/kubernetes/helm.go	Helm.TemplateLocalChart	66.67%	70.00%	+3.33%
pkg/app/piped/cloudprovider/kubernetes/helm.go	Helm.TemplateRemoteChart	0.00%	0.00%	+0.00%
pkg/app/piped/toolregistry/registry.go	registry.Helm	82.35%	88.24%	+5.88%

[pipecd-bot]

The following ISSUES will be created once got merged. If you want me to skip creating the issue, you can use /todo skip command.

Details

---

1. Preinstall a helm version inside CI runner to avoid installing.

https://github.com/pipe-cd/pipe/blob/f4bc3691c2ae680f6a458b86cba84110a944a3fe/pkg/app/piped/cloudprovider/kubernetes/helm_test.go#L59-L62

This was created by todo plugin since "TODO:" was found in f4bc369 when #1132 was merged. cc: @tnqv.

[tnqv]

@nghialv Thanks for your review!! 👍
I refactored, please check again when you have time!

[nghialv]

/todo skip

[nghialv]

/trigger presubmits

[pipecd-bot]

@nghialv: Your requested presubmits has been scheduled in response to this comment.

[nghialv]

Nice. Thank you very much.

[pipecd-bot]

This pull request is APPROVED by nghialv.

Approvers can cancel the approval by writing /approve cancel in a comment. Any additional commits also will change this pull request to be not-approved.

[pipecd-bot]

Code coverage for golang is 32.95%. This pull request increases coverage by 0.04%.

File	Function	Base	Head	Diff
pkg/app/piped/cloudprovider/kubernetes/manifest.go	Manifest.GetNestedMap	--	75.00%	+75.00%
pkg/app/piped/cloudprovider/kubernetes/helm.go	Helm.TemplateLocalChart	66.67%	70.00%	+3.33%
pkg/app/piped/cloudprovider/kubernetes/helm.go	Helm.TemplateRemoteChart	0.00%	0.00%	+0.00%
pkg/app/piped/toolregistry/registry.go	registry.Helm	82.35%	88.24%	+5.88%