[cmake] Refactored MKL find logic to use CONFIG mode

Related:

• https://discourse.opengeosys.org/t/no-changes-from-time-step-1-through-10-for-gas-injection/1319/15

1. Feature description was added to the changelog
2. Tests covering your feature were added?
3. Any new feature or behavior change was documented?
4. manually check on mac