Update QA checklist to capture identified regression

[jcfr]

What's the problem this feature will solve?

Prevent regressions identified in the following issues:

• [x] https://github.com/BICCN/cell-locator/issues/178
• [x] https://github.com/BICCN/cell-locator/issues/179
• [x] https://github.com/BICCN/cell-locator/issues/180
• [x] https://github.com/BICCN/cell-locator/issues/184
• [x] https://github.com/BICCN/cell-locator/issues/185

Describe the solution you'd like

To avoid the regressions described in the issue listed above, the file .github/ISSUE_TEMPLATE/qa-checklist.md should be updated.

Alternative Solutions

Implement self-tests in python.

Additional context

NA