Feature/move unittest

[NicolasColombi]

Changes proposed in this PR:

Move lazy unittest to the integration folder.

List of tests moved:

• climada/engine/test/test_impact_data/test_emdat_damage_yearlysum (~ 6 sec)
• climada/engine/unsequa/test/test_unsequa/test_calc_uncertainty_pass (~ 4.5 sec)
• climada/engine/unsequa/test/test_unsequa/test_plot_unc_cb (~ 3.5 sec)
• climada/engine/test/test_impact_data/test_scale_impact2refyear (~ 4 sec)
• climada/engine/test/test_impact_data/test_emdat_to_impact_scale (~ 7 sec)
• climada/engine/unsequa/test/test_unsequa.py/test_calc_sensitivity_pass (~ 2.3 sec)

This PR decrease the cost of unittest by around 27s. All tests are placed in the integration folder in the new file test_engine.py, except for one plotting function which has his place in: test_plot.py

As a consequence of moving tests, 5 Pylint warnings are transfered from test_unsequa.py to test_plot.py

PR Author Checklist

• Read the Contribution Guide
• Correct target branch selected (if unsure, select develop)
• Descriptive pull request title added
• Source branch up-to-date with target branch
• Documentation updated
• Tests updated
• Tests passing
• No new linter issues
• Changelog updated

PR Reviewer Checklist

• Read the Contribution Guide
• CLIMADA Reviewer Checklist passed
• Tests passing
• No new linter issues

[peanutfun]

@NicolasColombi something is off here. You reverted your original commit, so there are no changes in this branch.

[peanutfun]

The changes in the first commit look good and the tests are passing on my machine. I'll handle this and merge immediately, as it might clash with some changes introduced tomorrow.