Improvements to NEMO offloading scripts

[sergisiso]

• Enables ICE (not not icethd yet), this is used by BENCH and the ORCA2 in ENMASE
• Prevents (if type info is available) characters on offloaded regions
• Converges the NEMOv4 and NEMOv5 produced directives/clauses
• Prevents skipping parallelising loops if they are collapsed anyway

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.90%. Comparing base (80b372f) to head (a6739f6).
⚠️ Report is 1207 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3047      +/-   ##
==========================================
- Coverage   99.92%   99.90%   -0.02%     
==========================================
  Files         365      366       +1     
  Lines       51716    51766      +50     
==========================================
+ Hits        51675    51717      +42     
- Misses         41       49       +8     

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[sergisiso]

Closing as these changes have mostly been introduced through other PRs