Remove vendor directory and enable go modules

[aledbf]

What this PR does / why we need it:

Types of changes

• 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 change)

Which issue/s this PR fixes

How Has This Been Tested?

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf

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• OWNERS [aledbf]

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[aledbf]

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[codecov-commenter]

Codecov Report

Merging #5764 into master will increase coverage by 0.00%.
The diff coverage is 33.33%.

@@           Coverage Diff           @@
##           master    #5764   +/-   ##
=======================================
  Coverage   58.65%   58.65%           
=======================================
  Files          88       88           
  Lines        6951     6959    +8     
=======================================
+ Hits         4077     4082    +5     
- Misses       2425     2426    +1     
- Partials      449      451    +2     

Impacted Files	Coverage Δ
cmd/nginx/main.go	5.37% <0.00%> (ø)
internal/ingress/annotations/class/main.go	54.54% <ø> (ø)
internal/ingress/controller/controller.go	49.59% <ø> (ø)
internal/ingress/controller/nginx.go	30.10% <50.00%> (+0.10%)	⬆️
internal/ingress/controller/store/store.go	58.57% <50.00%> (-0.20%)	⬇️
cmd/nginx/flags.go	82.56% <100.00%> (+0.18%)	⬆️

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[aledbf]

/retest

[aledbf]

/test all

[aledbf]

/retest

[aledbf]

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[aledbf]

/retest