feat: error messages when connecting to mssql

[AAfghahi]

SUMMARY

Added custom error messages for an incorrect database name, cleaned up some language in other tests.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

added unit tests

ADDITIONAL INFORMATION

• Has associated issue:
• 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 #14171 (771b81d) into master (fe21de3) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 771b81d differs from pull request most recent head 781dac3. Consider uploading reports for the commit 781dac3 to get more accurate results

@@            Coverage Diff             @@
##           master   #14171      +/-   ##
==========================================
- Coverage   79.87%   79.87%   -0.01%     
==========================================
  Files         944      944              
  Lines       47916    47916              
  Branches     6067     6067              
==========================================
- Hits        38272    38271       -1     
- Misses       9520     9521       +1     
  Partials      124      124              

Flag	Coverage Δ
cypress	56.32% <ø> (-0.01%)	⬇️
hive	80.37% <ø> (ø)
mysql	80.64% <ø> (ø)
postgres	80.67% <ø> (ø)
presto	80.39% <ø> (ø)
python	81.23% <ø> (ø)
sqlite	80.27% <ø> (ø)

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

Impacted Files	Coverage Δ
superset/databases/commands/test_connection.py	98.11% <ø> (ø)
superset/db_engine_specs/mssql.py	95.45% <ø> (ø)
superset/errors.py	100.00% <ø> (ø)
...set-frontend/src/dashboard/util/getDropPosition.js	90.90% <0.00%> (-1.52%)	⬇️

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[betodealmeida]

This should have the same copy as code 1015 below:

Suggested change

	"Issue 1015 - The database is " "spelled incorrectly or does not exist."
	"Issue 1015 - Either the database is "
	"spelled incorrectly or does not exist."

[betodealmeida]

The copy in issue 1015 should be identical everywhere.

[AAfghahi]

sounds good, will update and then ping you.

[betodealmeida]

Awesome sauce!