Fix tests/unit/utils/test_jinja.py

[dwoz]

Description of Issue

The tests in tests/unit/utils/test_jinja.py rely on a file_buffer_size option getting set. They have issues if we run unit tests by themselves. We need to track down where the file_buffer_size option gets set when the tests are run with the full test suite. Then refactor the tests so they don't rely on any other tests.

Setup

Remove the file_buffer_size option which was added in #54264. Run the tests by themselves and with the full test suite.

[stale]

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