feat(databricks-jdbc-driver): Implement connection checking without waking up SQL warehouse

[KSDaemon]

This updates Databricks test connection flow to use REST API instead of establishing real JDBC connection (which prevents SQL WH from suspending)

Check List

• Tests have been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.50%. Comparing base (940c30f) to head (76897d0).
Report is 2 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (940c30f) and HEAD (76897d0). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (940c30f)	HEAD (76897d0)
cubesql	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #9529       +/-   ##
===========================================
- Coverage   80.28%   57.50%   -22.78%     
===========================================
  Files         395      165      -230     
  Lines       97355    13504    -83851     
  Branches     2278     2278               
===========================================
- Hits        78158     7766    -70392     
+ Misses      18889     5430    -13459     
  Partials      308      308               

Flag	Coverage Δ
cube-backend	57.50% <ø> (ø)
cubesql	?

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