[Docs][flyteagent] Update Databricks Agent Setup to V2

[Future-Outlier]

Docs link

• databricks agent: https://flyte--5766.org.readthedocs.build/en/5766/deployment/agents/databricks.html

Related PRs

• flytekit change
  Rename databricks task type flytekit#2574

• flytesnacks change
  Update Databricks agent example to V2 flytesnacks#1733

Tracking issue

#3936

Why are the changes needed?

We want to let users run k8s spark and databricks agent together in the same workflow.

What changes were proposed in this pull request?

update default-for-task-types for databricks.

How was this patch tested?

In this PR by Kevin.
flyteorg/flytekit#2574

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.30%. Comparing base (28f65b3) to head (a3f8370).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5766   +/-   ##
=======================================
  Coverage   36.30%   36.30%           
=======================================
  Files        1305     1305           
  Lines      110000   110000           
=======================================
  Hits        39932    39932           
  Misses      65912    65912           
  Partials     4156     4156           

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	55.62% <ø> (ø)
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.21% <ø> (ø)
unittests-flyteidl	7.12% <ø> (ø)
unittests-flyteplugins	53.35% <ø> (ø)
unittests-flytepropeller	41.89% <ø> (ø)
unittests-flytestdlib	55.21% <ø> (ø)

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