update mockery to version 2 and adapt to tools-install approach

[rbroggi]

Signed-off-by: rbroggi ro_broggi@hotmail.com

Which problem is this PR solving?

• Updating mockery to v2 which is currently maintained

Short description of the changes

Mockery v2 give us 2 main benefits:

1. it adapts to our install-tools make target approach
2. it is well maintained

[codecov]

Codecov Report

Merging #3358 (fa78470) into master (7844198) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3358   +/-   ##
=======================================
  Coverage   96.45%   96.45%           
=======================================
  Files         259      259           
  Lines       15166    15166           
=======================================
  Hits        14629    14629           
  Misses        453      453           
  Partials       84       84           

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