feat: send CI origin and GitHub Actions run URL on API requests (#1110)

Partially resolves apify/apify-core#26861

When `CI=true`, send `X-Apify-Request-Origin: CI` instead of `CLI`.
In GitHub Actions, also send `X-Apify-Github-Actions-Run-Url` so Console
can link build rows back to the workflow run.

All env vars used (`CI`, `GITHUB_ACTIONS`, `GITHUB_SERVER_URL`,
`GITHUB_REPOSITORY`, `GITHUB_RUN_ID`) should be set automatically by the
GitHub Actions runner (no extra workflow setup needed).