Add web tests

[cakecatz]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[pipecd-bot]

Code coverage for golang is 33.49%. This pull request does not change code coverage.

[pipecd-bot]

Code coverage for javascript is 86.64%. This pull request increases coverage by 0.46%.

File	Base	Head	Diff
src/modules/delete-application.ts	43.75%	81.25%	+37.50%
src/modules/pipeds.ts	65.71%	74.29%	+8.57%

[nghialv]

👍
/approve

[pipecd-bot]

This pull request is APPROVED by nghialv.

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.