[tests-only] [full-ci] Remove githubComment and unused earlyFail from drone CI

[phil-davis]

• It is no longer possible to post a GitHub comment when an acceptance test pipeline fails. The token is no longer available to PRs. So remove this from CI.
• The earlyFail setting is not used any more in the code, so remove it.

Part of issue https://github.com/owncloud/QA/issues/820

[sonarcloud[bot]]

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