Remove collation info from MSSQL column type

[villebro]

CATEGORY

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• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

MSSQL columns can have lengthy types due to collations, for example NVARCHAR(50) COLLATE SQL_LATIN1_GENERAL_CP1_CI_AS, exceeding the 32 character limit in Superset. This PR copies logic from the MySQL spec which removes the unnecessary collation info.

TEST PLAN

Test locally

ADDITIONAL INFORMATION

• Has associated issue: Fixes Tables from MSSQL not showing on Table View #7870
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

@vitorbellini @syazwan0913

[codecov-io]

Codecov Report

Merging #7963 into master will decrease coverage by 0.01%.
The diff coverage is 16.66%.

@@            Coverage Diff            @@
##           master   #7963      +/-   ##
=========================================
- Coverage   65.61%   65.6%   -0.02%     
=========================================
  Files         469     469              
  Lines       22381   22387       +6     
  Branches     2432    2432              
=========================================
+ Hits        14686   14687       +1     
- Misses       7574    7579       +5     
  Partials      121     121

Impacted Files	Coverage Δ
superset/db_engine_specs/mssql.py	64.28% <16.66%> (-12.99%)	⬇️

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[mistercrunch]

LGTM