Clarify the support for the Java/Scala SDK in the docs

[eapolinario]

Why are the changes needed?

Support for flytekit-java is driven by the community, so let's reflect that in the documentation.

What changes were proposed in this pull request?

Remove the first-class support from the docs, instead mention that flytekit-java is community-driven.

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

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

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.91%. Comparing base (3082cd3) to head (5103d77).
Report is 119 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5582      +/-   ##
==========================================
+ Coverage   35.02%   35.91%   +0.88%     
==========================================
  Files        1204     1301      +97     
  Lines      104634   109403    +4769     
==========================================
+ Hits        36653    39288    +2635     
- Misses      64065    66018    +1953     
- Partials     3916     4097     +181     

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	53.74% <ø> (ø)
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.28% <ø> (ø)
unittests-flyteidl	7.09% <ø> (ø)
unittests-flyteplugins	53.31% <ø> (ø)
unittests-flytepropeller	41.75% <ø> (ø)
unittests-flytestdlib	55.25% <ø> (?)

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