[k8s plugin] Implement ignoring istio virtual service on primary rollout stage

[ffjlabo]

What this PR does:

Implemented the logic to ignore the virtual service from primary manifests.

This logic is implemented on the pipedv0.

pipecd/pkg/app/piped/executor/kubernetes/primary.go

Lines 57 to 86 in e1d78ff

	switch routingMethod {
	// In case of routing by Pod selector,
	// all manifests can be used as primary manifests.
	case config.KubernetesTrafficRoutingMethodPodSelector:
	primaryManifests = manifests
	// In case of routing by Istio,
	// VirtualService manifest will be used to manipulate the traffic ratio.
	// Other manifests can be used as primary manifests.
	case config.KubernetesTrafficRoutingMethodIstio:
	// Firstly, find the VirtualService manifests.
	istioCfg := e.appCfg.TrafficRouting.Istio
	if istioCfg == nil {
	istioCfg = &config.IstioTrafficRouting{}
	}
	trafficRoutingManifests, err := findIstioVirtualServiceManifests(manifests, istioCfg.VirtualService)
	if err != nil {
	e.LogPersister.Errorf("Failed while finding traffic routing manifest: (%v)", err)
	return model.StageStatus_STAGE_FAILURE
	}
	// Then remove them from the list of primary manifests.
	if len(trafficRoutingManifests) > 0 {
	primaryManifests = make([]provider.Manifest, 0, len(manifests)-1)
	for _, m := range manifests {
	if m.Key == trafficRoutingManifests[0].Key {
	continue
	}
	primaryManifests = append(primaryManifests, m)
	}
	}

Why we need it:

Which issue(s) this PR fixes:

Part of #5764

Does this PR introduce a user-facing change?:

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

[codecov]

Codecov Report

❌ Patch coverage is 63.15789% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 28.72%. Comparing base (8e46458) to head (22d2f4c).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...pp/pipedv1/plugin/kubernetes/deployment/primary.go	63.15%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6258      +/-   ##
==========================================
+ Coverage   28.69%   28.72%   +0.03%     
==========================================
  Files         560      560              
  Lines       59738    59754      +16     
==========================================
+ Hits        17140    17165      +25     
+ Misses      41281    41270      -11     
- Partials     1317     1319       +2     

Flag	Coverage Δ
.	23.22% <ø> (ø)
.-pkg-app-pipedv1-plugin-analysis	32.64% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes	58.19% <63.15%> (+0.29%)	⬆️
.-pkg-app-pipedv1-plugin-kubernetes_multicluster	67.48% <ø> (ø)
.-pkg-app-pipedv1-plugin-scriptrun	54.83% <ø> (ø)
.-pkg-app-pipedv1-plugin-terraform	39.25% <ø> (ø)
.-pkg-app-pipedv1-plugin-wait	35.51% <ø> (ø)
.-pkg-app-pipedv1-plugin-waitapproval	55.73% <ø> (ø)
.-pkg-plugin-sdk	50.47% <ø> (+0.19%)	⬆️
.-tool-actions-gh-release	19.23% <ø> (ø)
.-tool-actions-plan-preview	25.51% <ø> (ø)
.-tool-codegen-protoc-gen-auth	0.00% <ø> (ø)

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[khanhtc1202]

@ffjlabo, please approve PR #6255 first and rebase this PR branch to make the test/go CI pass 👀

[ffjlabo]

@khanhtc1202
Thank you, I approved the PR and rebased this branch. The CI has passed.

[Warashi]

LGTM 👍🏻

[khanhtc1202]

thanks 👍