Resolve "nitrile insert -Pfusion and -Pgeneric_fusion, even when clm doesn't support it"

What does this MR do?

Changes the toClmOptions function that generates the clm flags to only insert -Pfusion and -Pgeneric_fusion flags when clm supports it (i.e. when it's >=1.2).

Changes to public APIs

none

Author's checklist (required)

• Intermediate commits compile (use git rebase -i main if not)
• Newly added code has a style consistent with the rest of the repository
• Newly added code is documented (guidelines)
• If bugs have been solved, tests have been added (guidelines)
• A changelog entry has been added (guidelines)
• If the nitrile.yml format has changed, a migration has been defined in Nitrile.Package.Migrate

Related issues

Closes #49 (closed)