[Feature Request] Add workflow to update snapshot HTML content files

[filzrev]

Is your feature request related to a problem? Please describe.
Currently CI workflow(ci,yml) don't validate snapshot HTML.
(Because BUILD_SERVER environment variable is not set)

And Snapshot HTML is not updated since Percy Test is introduced.
So it cause diffs when running tests on local environment.

Describe the solution you'd like

Add separated CI workflow to update snapshot HTMLs.

This workflow should be invoked with workflow_dispatch trigger.
Because GitHub action workflows don't allow to invoke another workflow(ci.yml) within a workflow except for workflow_dispatch trigger.

Expected steps to update snapshot

1. Manually invoke snapshot update workflow from GitHub Action UI or gh workflow run command.
2. Run snapshot tests.
3. If diffs exists after tests. Commit diff files. and invoke ci.yml workflow.