build: proper link to PETSc library with absolute path

[rolanddenis]

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Description

When using pkg_search_module to find PETSc, it populates (at least) two variables: PETSC_LIBRARIES that contains only the name of the library (ie petsc) and PETSC_LINK_LIBRARIES that contains the absolute path to the library.

Until this fix, only PETSC_LIBRARIES was used that leads to linkage error for some configurations, eg when PETSc is not installed system-wide but only through a package manager like in a conda environment.

Using PETSC_LINK_LIBRARIES instead fix this issue.

How has this been tested?

Compiling and launching affected targets.

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