Deprecate moved warning functions

[carmocca]

What does this PR do?

Keep BC for users importing these utility functions from the specific distributed.py file

To be included in the 1.3.8 release

Closes #8084

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[codecov]

Codecov Report

Merging #8085 (e4e38bb) into master (f79f0f9) will decrease coverage by 5%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #8085    +/-   ##
=======================================
- Coverage      92%     87%    -5%     
=======================================
  Files         210     210            
  Lines       13617   13617            
=======================================
- Hits        12488   11846   -642     
- Misses       1129    1771   +642