Finally use published API client package; goodbye repository-owned client!

[syucream]

At #902, we've finally got published npm package here.
https://github.com/dmm-com/airone/pkgs/npm/airone-apiclient-typescript-fetch/118338298

So, now we can replace code on frontend/src/apiclient/autogenerated which's simple, but painful mechanism with installing @dmm-com/airone-apiclient-typescript-fetch. I do:

• replace the existing import statements with the published package.
• describe how to use the new mechanism
• remove frontend/src/apiclient/autogenerated, goodbye! 👋

As for #834, I also describe how to work/use the mechanism.

[syucream]

The failure cause on the build & test jobs is that @dmm-com/airone-apiclient-typescript-fetch@0.0.2 is not the latest. So we need to publish the latest version.
https://github.com/dmm-com/airone/actions/runs/5910330757/job/16031816547?pr=918
https://github.com/dmm-com/airone/actions/runs/5910330757/job/16031816500?pr=918

[syucream]

@userlocalhost @hinashi If the changes on this PR looks no problem, then we need to publish the latest client. Plz label release-apiv2-client after the review?

[hinashi]

LGTM!

[syucream]

@hinashi Thanks for your catching npm-ci error! I guess we need to modify the workflow definition, so I wanna trying:

1. modify the workflow defined at master. just merging Enable to install dependencies with GITHUB_TOKEN #927
2. merge the master branch to this PR
3. re-labeling to trigger the workflow on this PR

[github-actions]

⚡ ⚡ ⚡ Now the latest apiv2 client npm package is available at:
https://github.com/dmm-com/airone/pkgs/npm/airone-apiclient-typescript-fetch/versions

[syucream]

Wow finallyyyyyyy! 🎉