Make add_increment build conditional on fv3jedi availability

[Copilot]

The add_increment subdirectory was built whenever oops was found, but it requires the fv3jedi library. This caused build failures in environments where fv3jedi is unavailable (e.g., ObsForge).

Changes

• Added find_package(fv3jedi) to main CMakeLists.txt
• Gated add_subdirectory(add_increment) on fv3jedi_FOUND in src/CMakeLists.txt

if ( oops_FOUND )
  # ... other subdirectories ...
  if ( fv3jedi_FOUND )
    add_subdirectory( add_increment )
  endif()
endif()

The add_increment tools now build only when both dependencies are available.

Original prompt

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This section details on the original issue you should resolve

<issue_title>FV3-JEDI add increment needs to only be build if FV3-JEDI is found</issue_title>
<issue_description>

DA-utils/src/CMakeLists.txt

Line 9 in 9113c30

add_subdirectory( add_increment )

This will fail if we try to build as part of ObsForge, for example...

It should only include this subdirectory in the CMake if the fv3jedi library is found</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes FV3-JEDI add increment needs to only be build if FV3-JEDI is found #70

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