Add ``fail_on_http_error`` arg to github repository reader. (#13366)

* catch http error

* fix missing variable

* add tests

* run pants tailor

* update tests with mock for all requests

* fix tests

* skip test if no github_token

* lint

* vbump

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Co-authored-by: Andrei Fajardo <92402603+nerdai@users.noreply.github.com>
Co-authored-by: Andrei Fajardo <andrei@nerdai.io>