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ARROW-14981: [CI][Docs] Upload built documents

We can use this in release process instead of building on release
manager's local environment.

Closes #11856 from kou/ci-docs-upload

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>