chore: Test cases for annotations and annotation layers incorrect creation through API

[geido]

SUMMARY

This is a follow-up PR based on this request #17234 (review).

It moves the integration tests that work best as unit tests and adds test cases to cover the creation of incorrect annotations and annotation layers through the API

Thanks @villebro for guiding me through this!

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #17246 (d7f9d3f) into master (4316fe6) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #17246      +/-   ##
==========================================
+ Coverage   76.96%   76.98%   +0.01%     
==========================================
  Files        1037     1037              
  Lines       55608    55617       +9     
  Branches     7588     7588              
==========================================
+ Hits        42800    42818      +18     
+ Misses      12558    12549       -9     
  Partials      250      250              

Flag	Coverage Δ
hive	81.57% <ø> (+0.04%)	⬆️
mysql	81.99% <ø> (+0.04%)	⬆️
postgres	82.00% <ø> (+0.04%)	⬆️
presto	81.86% <ø> (+0.03%)	⬆️
python	82.50% <ø> (+0.03%)	⬆️
sqlite	81.68% <ø> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/db_engine_specs/presto.py	89.95% <0.00%> (-0.42%)	⬇️
superset/connectors/sqla/models.py	87.39% <0.00%> (-0.08%)	⬇️
superset/annotation_layers/api.py	84.87% <0.00%> (+1.68%)	⬆️
superset/cli.py	54.92% <0.00%> (+2.07%)	⬆️
superset/annotation_layers/annotations/api.py	87.96% <0.00%> (+3.00%)	⬆️

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[villebro]

LGTM, but will let @dpgaspar give the final verdict as he originally requested the changes

[dpgaspar]

For completeness add 1 more test for update, making sure we can update a single field, since no field is required on PUTs

[geido]

@dpgaspar thanks for your feedback. @villebro helped me go through your requests and we think we handled them all now. Please let me know if there is any other improvement that you see. Thank you!