Fix various issues in package configuration file

[jhendersonHDF]

Fix find_dependency() calls so that PRIVATE-linked libraries are only propagated as transitive link requirements for static library targets

Add missing find_dependency() calls for some PRIVATE-linked libraries

Fix issue where parallel-enabled HDF5 can fail to locate MPI Fortran support, even when HDF5 Fortran support isn't requested

Set HDF5_LIB_TYPE to only shared or static, depending on requested library type, rather than a list that could include both shared and static

Fix HDF5_LIB_TYPE being undefined when components are specified, but shared/static isn't

Reduce scope of modifications to CMAKE_MODULE_PATH so changes aren't propagated to consuming projects

Add check for both shared and static libraries being requested and fail if so

Remove enable_language() call in favor of checking enabled languages and failing if required language isn't enabled

Add missing CMake variable for digitally signed plugins feature

Fix CMake variable for HDF5_DIMENSION_SCALES_NEW_REF option

[github-actions]

Review Checklist

This PR touches the following areas. Each needs a sign-off
from its listed owners before merging.

• src — @mattjala
  • @glennsong09 (manually added) — approval required
• config — @mattjala
• release_docs
  • @glennsong09 (manually added) — approval required

[jhendersonHDF]

I manually tested the issues fixed by these changes, but plan to follow this up with a separate PR that adds testing of the installed .cmake files.