Add missing l and L suffixes in int32 and int64 printers for both Lin and STM

[jmid]

This PR adds missing l and L suffixes in int32 and int64 printers for both Lin and STM,
which meant that int32 and int64 literals couldn't just be copy-pasted into, e.g., utop.

The fix simply forwards the calls to QCheck.Print.int{32,64}, thereby solving this in one central place.
These were furthermore some of the only remaining exceptions to type combinators not relying on QCheck.Print,
thus restoring OCD world order... 🤓

QCheck.Print.int{32,64} were added in 0.24 - but we already have 0.25 as a lower bound, so all should be well.

[jmid]

Note: The Util int{32,64} pp-functions used by most STM show_cmd functions already prints the suffixes.
Hence the patch has an impact mostly on Lin tests and STM combinator-annotated results.

CI summary: all 50 workflows passed

[jmid]

CI summary for merge to main: all 51 workflows passed