T10839 many to many relationships

[niden]

Hello!

• Type: bug fix
• Link to issue: ModelsManager->getRelations doesn't return the many through relations #10839

In raising this pull request, I confirm the following:

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR
• I updated the CHANGELOG

Models manager getRelations() now returns the many to many relationships

Thanks

[niden]

cc @sergeyklay

[codecov]

Codecov Report

Merging #14086 into 4.0.x will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            4.0.x   #14086      +/-   ##
==========================================
- Coverage   71.32%   71.31%   -0.01%     
==========================================
  Files         479      479              
  Lines       94032    94042      +10     
==========================================
  Hits        67066    67066              
- Misses      26966    26976      +10

Impacted Files	Coverage Δ
ext/phalcon/mvc/model/manager.zep.c	64.56% <0%> (-0.31%)	⬇️

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