Update controller to detect and mark deploying status for applications

[nghialv]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #1369

Does this PR introduce a user-facing change?:

NONE

[pipecd-bot]

Code coverage for golang is 33.91%. This pull request decreases coverage by -0.05%.

File	Function	Base	Head	Diff
pkg/app/piped/controller/controller.go	reportApplicationDeployingStatus	--	0.00%	+0.00%
pkg/app/piped/controller/planner.go	planner.DoneDeploymentStatus	--	0.00%	+0.00%
pkg/app/piped/controller/controller.go	controller.syncPlanners	0.00%	0.00%	+0.00%
pkg/app/piped/controller/controller.go	controller.syncSchedulers	0.00%	0.00%	+0.00%
pkg/app/piped/controller/planner.go	planner.Run	0.00%	0.00%	+0.00%
pkg/app/piped/controller/controller.go	controller.reportApplicationDeployingStatus	0.00%	--	+-0.00%

[nakabonne]

/lgtm

[khanhtc1202]

🚀
/approve

[pipecd-bot]

This pull request is APPROVED by khanhtc1202.

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.