(Closes #3334) Make module-inlining mandatory for Kernel transformations

[arporter]

A second attempt at this after my git fu let me down badly.
Original changes are here: https://github.com/stfc/PSyclone/pull/3294/changes#diff-436bf7f3b5f30b4c1d6ff1f9a0a8e144f924bae78cbcc9595b30fc5954e715e0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.95%. Comparing base (3477550) to head (9f8bd35).
⚠️ Report is 29 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3388      +/-   ##
==========================================
- Coverage   99.95%   99.95%   -0.01%     
==========================================
  Files         388      389       +1     
  Lines       54507    54377     -130     
==========================================
- Hits        54485    54355     -130     
  Misses         22       22              

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[arporter]

ITs were all green and coverage is now OK. Ready for a first review from @hiker, @LonelyCat124 or @sergisiso.

[sergisiso]

I got worried that the previous PR which still had several open comments ended saying it was merged:

But what happened is that those commits were part of the 1734_stricter_symbols branch, with follow up commits reverting the changes, and github spoted that those were merged. @arporter This is probably why you coudn't see the changes after brining the branch it to master, the master history already had those commits plus commits reverting them.

Anyway I've checked that the comments I made in the previous PR are now addressed or ported to the new review.

[sergisiso]

@arporter Most comments raised in the other PR are now resolved. There is just some minor clean up/clarfications to do.

[arporter]

Ready for another look now, I've just fired-off the ITs again.

[sergisiso]

@arporter All comments have been addressed and the integration test pass. I could not find more mentions of the old functionallity. Thanks for the multiple takes on this, it's a good simplification of the codebase and the documentation.