Convert unit tests to Typescript

[kravets-levko]

Part of PECO-1390

Initially I planned to convert unit tests gradually, but there were issues with collecting coverage data. So I had to convert everything at once

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.54839% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 92.93%. Comparing base (3eed509) to head (6d2718b).

Files	Patch %	Lines
...nnection/auth/DatabricksOAuth/AuthorizationCode.ts	89.28%	2 Missing and 1 partial :warning:
lib/connection/auth/DatabricksOAuth/index.ts	80.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #258      +/-   ##
==========================================
- Coverage   93.06%   92.93%   -0.13%     
==========================================
  Files          65       64       -1     
  Lines        1586     1572      -14     
  Branches      280      282       +2     
==========================================
- Hits         1476     1461      -15     
+ Misses         46       44       -2     
- Partials       64       67       +3     

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