Unify component story writing style

[cakecatz]

What this PR does / why we need it:

• Use Story type for story components.
• Use PascalCase for components name.
• Create a Template component then use it for each stories.
  • https://github.com/pipe-cd/pipe/blob/fix-stories/pkg/app/web/.scaffdog/component.md#-inputsname-indexstoriestsx

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[pipecd-bot]

Code coverage for golang is 32.34%. This pull request does not change code coverage.

[pipecd-bot]

Code coverage for javascript is 85.96%. This pull request decreases coverage by -0.01%.

File	Base	Head	Diff
src/fixtures/dummy-environment.ts	100.00%	100.00%	+0.00%
src/components/environment-list-item/index.tsx	91.67%	88.89%	-2.78%
src/mocks/services/environment.ts	100.00%	100.00%	+0.00%
src/modules/environments.ts	96.00%	96.15%	+0.15%

[khanhtc1202]

/lgtm

[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.