♻️ webserver: fixes mypy issues in exporter plugin

[GitHK]

What do these changes do?

Addresses remaining issues with mypy in webserver's exporter module.

Related issue/s

• Maintenance: make mypy pass in all services/packages in repo #4071

How to test

DevOps Checklist

[codecov]

Codecov Report

Merging #4339 (afb8f70) into master (d3a78c6) will decrease coverage by 6.9%.
The diff coverage is 100.0%.

@@            Coverage Diff            @@
##           master   #4339      +/-   ##
=========================================
- Coverage    85.6%   78.8%    -6.9%     
=========================================
  Files         978     392     -586     
  Lines       41979   20415   -21564     
  Branches      993     173     -820     
=========================================
- Hits        35968   16089   -19879     
+ Misses       5787    4277    -1510     
+ Partials      224      49     -175     

Flag	Coverage Δ
integrationtests	61.2% <62.5%> (-6.8%)	⬇️
unittests	86.2% <75.0%> (+3.0%)	⬆️

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

Impacted Files	Coverage Δ
...er/exporter/_formatter/xlsx/dataset_description.py	100.0% <ø> (ø)
...core_service_webserver/exporter/_formatter/_sds.py	56.9% <100.0%> (+0.6%)	⬆️
...erver/exporter/_formatter/xlsx/code_description.py	100.0% <100.0%> (ø)
...bserver/exporter/_formatter/xlsx/core/xlsx_base.py	92.3% <100.0%> (ø)
...ver/exporter/_formatter/xlsx/directory_manifest.py	100.0% <100.0%> (ø)
...rc/simcore_service_webserver/exporter/_handlers.py	97.2% <100.0%> (+<0.1%)	⬆️

... and 682 files with indirect coverage changes

[pcrespov]

🎉

[codeclimate]

Code Climate has analyzed commit afb8f70 and detected 0 issues on this pull request.

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.1% Duplication