set xxx_AVAILABLE as protected

[Borda]

What does this PR do?

all the variable are just for internal usage so we shall not expose them to the user
Moreover, users shall not rely on their correctness...

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[codecov]

Codecov Report

Merging #5082 (5f39dd0) into master (0327f6b) will decrease coverage by 0%.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #5082   +/-   ##
======================================
- Coverage      93%     93%   -0%     
======================================
  Files         134     134           
  Lines        9907    9906    -1     
======================================
- Hits         9206    9205    -1     
  Misses        701     701           

[justusschock]

Im not sure we really need this. I think we should just not export it through init and then we should be fine.

[Borda]

Im not sure we really need this. I think we should just not export it through init and then we should be fine.

even we do not export it, users can still use it and complain... I would rather keep protected these 3rd-party checks...

[mergify]

This pull request is now in conflict... :(

[tchaton]

LGTM !