feat: migrate mocks to mockery

[chenrui333]

fixes #4664

[github-actions[bot]]

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[james0209]

If switching to Mockery, it's probably worth using the packages configuration scheme instead - the current draft PR implementation is deprecated.

https://vektra.github.io/mockery/latest/migrating_to_packages/

e.g. .mockery.yaml config for a separate mocks directory mirroring the directory structure of your original repo (which I think is better)

with-expecter: True
dir: mocks/{{ replaceAll .InterfaceDirRelative "internal" "internal_" }} 
mockname: "{{.InterfaceName}}"
outpkg: "{{.PackageName}}"
filename: "{{.InterfaceName}}.go"
all: True
packages:
  github.com/runatlantis/atlantis:
    config:
      recursive: True

Or you could have the mocks adjacent to the interface if you wanted: https://vektra.github.io/mockery/latest/migrating_to_packages/#adjacent-to-interface

[chenrui333]

@james0209 thanks for weighing in here, yeah, I was definitely thinking that I was going with the packages configuration route. :) Any way, let me refine the PR a bit.

[chenrui333]

todos for this pr:

• update the mocks to looks similar as pegomock
• import mockery and rerun tests