Add support for the {{ .App.Name }} and {{ .K8s.Namespace }} syntax in the query template

[Warashi]

What this PR does:

as title

Why we need it:

To have backword compatibility with pipedv0 for rendering query metrics.
We will deprecate .K8s.Namespace for plugin-arch piped.

Which issue(s) this PR fixes:

Part of #6068
Part of #5542
Follows #6159

Does this PR introduce a user-facing change?: No

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[khanhtc1202]

🚀

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 28.76%. Comparing base (9835164) to head (f28a95d).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...p/pipedv1/plugin/analysis/executestage/analysis.go	86.66%	2 Missing ⚠️
pkg/app/pipedv1/plugin/analysis/plugin.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6186      +/-   ##
==========================================
+ Coverage   28.73%   28.76%   +0.02%     
==========================================
  Files         557      557              
  Lines       59396    59407      +11     
==========================================
+ Hits        17070    17090      +20     
+ Misses      41017    41008       -9     
  Partials     1309     1309              

Flag	Coverage Δ
.	23.28% <ø> (ø)
.-pkg-app-pipedv1-plugin-analysis	32.64% <85.71%> (+0.84%)	⬆️
.-pkg-app-pipedv1-plugin-kubernetes	60.24% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes_multicluster	67.48% <ø> (ø)
.-pkg-app-pipedv1-plugin-scriptrun	54.83% <ø> (ø)
.-pkg-app-pipedv1-plugin-terraform	38.31% <ø> (ø)
.-pkg-app-pipedv1-plugin-wait	35.51% <ø> (ø)
.-pkg-app-pipedv1-plugin-waitapproval	68.62% <ø> (ø)
.-pkg-plugin-sdk	50.37% <ø> (ø)
.-tool-actions-gh-release	19.23% <ø> (ø)
.-tool-actions-plan-preview	25.30% <ø> (ø)
.-tool-codegen-protoc-gen-auth	0.00% <ø> (ø)

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[ffjlabo]

👍

[khanhtc1202]

Thanks 👌