Implement FetchDefinedStages and BuildQuickSyncStages with plugin SDK

[ffjlabo]

What this PR does:

as title.
Also, I checked the plan is working with the patch below.

patch

diff --git a/pkg/app/pipedv1/plugin/kubernetes/main.go b/pkg/app/pipedv1/plugin/kubernetes/main.go
index 0b2450f4a..c8c7ad604 100644
--- a/pkg/app/pipedv1/plugin/kubernetes/main.go
+++ b/pkg/app/pipedv1/plugin/kubernetes/main.go
@@ -18,25 +18,24 @@ import (
        "log"

        kubeconfig "github.com/pipe-cd/pipecd/pkg/app/pipedv1/plugin/kubernetes/config"
-       "github.com/pipe-cd/pipecd/pkg/cli"
        "github.com/pipe-cd/pipecd/pkg/plugin/sdk"
 )

-func main() {
-       app := cli.NewApp(
-               "pipecd-plugin-kubernetes",
-               "Plugin component to deploy Kubernetes Application.",
-       )
-       app.AddCommands(
-               NewPluginCommand(),
-       )
-       if err := app.Run(); err != nil {
-               log.Fatal(err)
-       }
-}
+// func main() {
+//     app := cli.NewApp(
+//             "pipecd-plugin-kubernetes",
+//             "Plugin component to deploy Kubernetes Application.",
+//     )
+//     app.AddCommands(
+//             NewPluginCommand(),
+//     )
+//     if err := app.Run(); err != nil {
+//             log.Fatal(err)
+//     }
+// }

 // TODO: use this after rewriting the plugin with the sdk
-func _main() {
+func main() {
        sdk.RegisterDeploymentPlugin[sdk.ConfigNone, kubeconfig.KubernetesDeployTargetConfig](&sdkPlugin{})
        if err := sdk.Run(); err != nil {
                log.Fatalln(err)
diff --git a/pkg/plugin/sdk/deployment.go b/pkg/plugin/sdk/deployment.go
index 40ab7faba..33dbef0f5 100644
--- a/pkg/plugin/sdk/deployment.go
+++ b/pkg/plugin/sdk/deployment.go
@@ -156,10 +156,14 @@ func (s *DeploymentPluginServiceServer[Config, DeployTargetConfig]) FetchDefined
        return &deployment.FetchDefinedStagesResponse{Stages: s.base.FetchDefinedStages()}, nil
 }
 func (s *DeploymentPluginServiceServer[Config, DeployTargetConfig]) DetermineVersions(context.Context, *deployment.DetermineVersionsRequest) (*deployment.DetermineVersionsResponse, error) {
-       return nil, status.Errorf(codes.Unimplemented, "method DetermineVersions not implemented")
+       return &deployment.DetermineVersionsResponse{}, nil
+       // return nil, status.Errorf(codes.Unimplemented, "method DetermineVersions not implemented")
 }
 func (s *DeploymentPluginServiceServer[Config, DeployTargetConfig]) DetermineStrategy(context.Context, *deployment.DetermineStrategyRequest) (*deployment.DetermineStrategyResponse, error) {
-       return nil, status.Errorf(codes.Unimplemented, "method DetermineStrategy not implemented")
+       return &deployment.DetermineStrategyResponse{
+               SyncStrategy: model.SyncStrategy_QUICK_SYNC,
+       }, nil
+       // return nil, status.Errorf(codes.Unimplemented, "method DetermineStrategy not implemented")
 }
 func (s *DeploymentPluginServiceServer[Config, DeployTargetConfig]) BuildPipelineSyncStages(ctx context.Context, request *deployment.BuildPipelineSyncStagesRequest) (*deployment.BuildPipelineSyncStagesResponse, error) {
        client := &Client{

Why we need it:

I want to rewrite some methods to execute the plan.

Which issue(s) this PR fixes:

Part of #4980 #5006

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

Attention: Patch coverage is 75.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 26.56%. Comparing base (e49c4fc) to head (4c2914f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/app/pipedv1/plugin/kubernetes/plugin.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5605      +/-   ##
==========================================
+ Coverage   26.53%   26.56%   +0.03%     
==========================================
  Files         474      474              
  Lines       50505    50535      +30     
==========================================
+ Hits        13399    13427      +28     
- Misses      36042    36045       +3     
+ Partials     1064     1063       -1     

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[Warashi]

Almost LGTM. I commented on nitpicks.

[Warashi]

👀 The parameter now seems to be not used.

[ffjlabo]

Thank you, fixed on e96d964

[t-kikuc]

LGTM

The PR title would be 'Implement FetchDefinedStages......?' "Implement FetchDefinedStages......"?
because it seems the first implementation rather than rewriting.

[ffjlabo]

@t-kikuc OK, changed PR title

[Warashi]

LGTM