Tensorboard interceptor keeps receiving events even after training

[renan-souza]

This has low priority because it can be easily worked around by calling consumer.stop(), but this is a bug that should be fixed.

[renan-souza]

I removed this test: https://github.com/ORNL/flowcept/blob/main/tests/plugins/test_tensorboard.py#L155 in this commit:
6d0ce57
This test may be related to this issue. When we fix tensorboard adapter issues, we should return with this test.

[renan-souza]

As of today, sometimes the assert len(docs) == 16 check still causes intermittent errors.
See: https://github.com/ORNL/flowcept/actions/runs/8023284655/job/21920203496?pr=111