[Backport 2.x] Propagate includes and excludes from fetchSourceContex…

[Gankris96]

…t to FieldsVisitor

Description

Backport of #17080

Related Issues

Resolves #[Issue number to be closed when this PR is merged]
PR is part of #2377
as part of the Derived source feature for k-NN.

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[Gankris96]

@jed326; @jmazanec15 Backport of #17080

[github-actions]

❕ Gradle check result for ff51295: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

Attention: Patch coverage is 73.91304% with 6 lines in your changes missing coverage. Please review.

Project coverage is 72.01%. Comparing base (fa08247) to head (ff51295).
Report is 2 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...n/java/org/opensearch/search/fetch/FetchPhase.java	40.00%	0 Missing and 6 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #17112      +/-   ##
============================================
+ Coverage     71.91%   72.01%   +0.10%     
- Complexity    65716    65792      +76     
============================================
  Files          5322     5322              
  Lines        306214   306232      +18     
  Branches      44655    44663       +8     
============================================
+ Hits         220206   220538     +332     
+ Misses        67630    67258     -372     
- Partials      18378    18436      +58     

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