chore: add user agent to Databricks requests

[betodealmeida]

SUMMARY

Set a "User-Agent" header on the Databricks connector.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

N/A

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• 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 #20660 (f8be567) into master (0ce0c6e) will decrease coverage by 0.00%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master   #20660      +/-   ##
==========================================
- Coverage   66.83%   66.83%   -0.01%     
==========================================
  Files        1753     1753              
  Lines       65808    65817       +9     
  Branches     7001     7001              
==========================================
+ Hits        43984    43989       +5     
- Misses      20035    20039       +4     
  Partials     1789     1789              

Flag	Coverage Δ
hive	53.88% <60.00%> (+<0.01%)	⬆️
mysql	82.37% <60.00%> (-0.01%)	⬇️
postgres	82.44% <60.00%> (-0.01%)	⬇️
presto	53.74% <60.00%> (+<0.01%)	⬆️
python	82.88% <60.00%> (-0.01%)	⬇️
sqlite	82.23% <60.00%> (-0.01%)	⬇️
unit	50.83% <60.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
superset/db_engine_specs/databricks.py	82.35% <55.55%> (-9.96%)	⬇️
superset/constants.py	100.00% <100.00%> (ø)

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[dungdm93]

User-Agent is very useful to backend analysis.
Trino should be follow this by set X-Trino-Source header