Apply worker pool to speed up plan-preview's execution

[nghialv]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #2296

Does this PR introduce a user-facing change?:

Apply worker pool to speed up plan-preview's execution

[pipecd-bot]

Code coverage for golang is 31.77%. This pull request decreases coverage by -0.06%.

File	Function	Base	Head	Diff
pkg/app/piped/planpreview/builder.go	builder.buildApp	--	0.00%	+0.00%
pkg/app/piped/planpreview/builder.go	builder.build	0.00%	0.00%	+0.00%

[pipecd-bot]

Code coverage for golang is 31.77%. This pull request decreases coverage by -0.06%.

File	Function	Base	Head	Diff
pkg/app/piped/planpreview/builder.go	builder.buildApp	--	0.00%	+0.00%
pkg/app/piped/planpreview/builder.go	builder.build	0.00%	0.00%	+0.00%

[nghialv]

/changelog

[pipecd-bot]

@nghialv: Changelog has been generated in response to this comment.

Details

Changelog since v0.13.1

Notable Changes

• Make plan-preview comment more readable in case there are some unchanged applications (#2305)
• Allow dynamically specify plan-preview command timeout from pipectl (#2299)

Internal Changes

• Refine error message when the deployment config file was not found (#2302)
• Fix flaky piped stat builder test (#2307)
• Add deployment chain into feature status (#2306)
• Add no-change mark to plan-preview result (#2300)
• Update controlplane cache monitor board (#2295)
• Implement Pipeds stat cleaner (#2287)

[khanhtc1202]

should we use the above wrapped logger? 👀

[nghialv]

Right. Nice catch!

[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. Calculating planpreview's diff for other application kinds.

https://github.com/pipe-cd/pipe/blob/9d167403458322dfac1f2bb4f1ac5105edf3cd77/pkg/app/piped/planpreview/builder.go#L260-L263

This was created by todo plugin since "TODO:" was found in 9d16740 when #2303 was merged. cc: @nghialv.

[pipecd-bot]

Code coverage for golang is 31.77%. This pull request decreases coverage by -0.06%.

File	Function	Base	Head	Diff
pkg/app/piped/planpreview/builder.go	builder.buildApp	--	0.00%	+0.00%
pkg/app/piped/planpreview/builder.go	builder.build	0.00%	0.00%	+0.00%

[khanhtc1202]

Nice work
/lgtm

[nakabonne]

Good improvement
/approve

[pipecd-bot]

This pull request is APPROVED by nakabonne.

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.