Drive-by clean-ups

[nedbat]

• removed Jira webhook code, since we don't expect to have Jira-initiated actions.
• pylint violations
• moved tests into the tests/ directory and consolidated to match the .py files
• move an if into a match/case

[codecov[bot]]

Codecov Report

Patch coverage: 97.61% and project coverage change: +3.34% :tada:

Comparison is base (bce4b0f) 80.36% compared to head (26d3b5c) 83.71%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #264 +/- ## ========================================== + Coverage 80.36% 83.71% +3.34% ========================================== Files 41 38 -3 Lines 3082 2916 -166 Branches 328 306 -22 ========================================== - Hits 2477 2441 -36 + Misses 572 442 -130 Partials 33 33 ``` | [Files Changed](https://app.codecov.io/gh/openedx/openedx-webhooks/pull/264?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openedx) | Coverage Δ | | |---|---|---| | [openedx\_webhooks/\_\_init\_\_.py](https://app.codecov.io/gh/openedx/openedx-webhooks/pull/264?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openedx#diff-b3BlbmVkeF93ZWJob29rcy9fX2luaXRfXy5weQ==) | `74.60% <ø> (-0.79%)` | :arrow_down: | | [openedx\_webhooks/github\_views.py](https://app.codecov.io/gh/openedx/openedx-webhooks/pull/264?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openedx#diff-b3BlbmVkeF93ZWJob29rcy9naXRodWJfdmlld3MucHk=) | `27.52% <0.00%> (+0.25%)` | :arrow_up: | | [openedx\_webhooks/tasks/\_\_init\_\_.py](https://app.codecov.io/gh/openedx/openedx-webhooks/pull/264?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openedx#diff-b3BlbmVkeF93ZWJob29rcy90YXNrcy9fX2luaXRfXy5weQ==) | `51.61% <ø> (-4.27%)` | :arrow_down: | | [tests/test\_utils.py](https://app.codecov.io/gh/openedx/openedx-webhooks/pull/264?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openedx#diff-dGVzdHMvdGVzdF91dGlscy5weQ==) | `100.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/openedx/openedx-webhooks/pull/264/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openedx)

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