Fix error when running tasks with Sentry integration enabled.

[junnplus]

closes #13797

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The PR most likely needs to run full matrix of tests because it modifies parts of the core of Airflow. However, committers might decide to merge it quickly and take the risk. If they don't merge it quickly - please rebase it to the latest master at your convenience, or amend the last commit of the PR, and push it with --force-with-lease.

[junnplus]

@ashb Some new checks were not successful.
Seems mock.create_autospec has a problem when python version < 3.7.3, I can skip these test?

[ashb]

The new tests you added are failing though.

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[junnplus]

@ashb I mark the 3.6 test as skipped. Please check again, thanks.

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[junnplus]

@ashb @kaxil We can merge this PR?