Include auto-generated files in recursive discovery by default

[LandonTClipp]

Description

Fixes #681

There are many legitimate use-cases where mockery needs to include auto-generated files in its recursive package discovery. We add an include-auto-generated parameter that is set to true by default, but can be set to false if users want to retain the old behavior. We are considering the old behavior to be a bug due to the large number of GitHub issues we'll likely get. The original motivation for adding this behavior was fixed through a different mechanism, which is why we're considering this to be a bugfix.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Version of Golang used when building/testing:

• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20

How Has This Been Tested?

Unit tests

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Patch coverage: 78.26087% and project coverage change: +0.07680% 🎉

Comparison is base (532f248) 75.29200% compared to head (b70c07a) 75.36880%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master        #682         +/-   ##
===================================================
+ Coverage   75.29200%   75.36880%   +0.07679%     
===================================================
  Files              9           9                 
  Lines           2226        2237         +11     
===================================================
+ Hits            1676        1686         +10     
- Misses           412         414          +2     
+ Partials         138         137          -1     

Files Changed	Coverage Δ
pkg/config/config.go	71.00592% <78.26087%> (+0.44140%)	⬆️

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