CMake: NetCDF find module hotfix

[program--]

This PR resolves a minor issue with the refactored NetCDF find module, and changes searching to rely only on the default search path as specified in CMP0074.

Additions

• Adds GLOBAL keyword to imported targets.

Removals

• Removes HINTS and PATHS from find_path and find_library calls.

Checklist

• PR has an informative and human-readable title
• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Code follows project standards (link if applicable)
• Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future todos are captured in comments
• Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)
• Reviewers requested with the Reviewers tool ➡️

Target Environment support

• Linux
• macOS

[stcui007]

I have tested the hotfix. It resolve the previous issue with NetCDF. Build and various test runs are successful.