chore: remove dependency on github.com/pkg/errors

[Fish-pro]

Signed-off-by: Fish-pro zechun.chen@daocloud.io

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[codecov]

Codecov Report

Base: 47.30% // Head: 47.29% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (e822655) compared to base (8917077).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head e822655 differs from pull request most recent head 73b2af2. Consider uploading reports for the commit 73b2af2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11886      +/-   ##
==========================================
- Coverage   47.30%   47.29%   -0.02%     
==========================================
  Files         245      245              
  Lines       41670    41669       -1     
==========================================
- Hits        19712    19706       -6     
- Misses      19972    19978       +6     
+ Partials     1986     1985       -1     

Impacted Files	Coverage Δ
server/server.go	54.03% <ø> (ø)
util/kube/portforwarder.go	0.00% <0.00%> (ø)
util/kustomize/kustomize.go	72.47% <ø> (ø)
applicationset/generators/pull_request.go	46.87% <0.00%> (-3.13%)	⬇️
applicationset/generators/matrix.go	69.49% <0.00%> (-0.26%)	⬇️
server/repository/repository.go	51.50% <0.00%> (-0.13%)	⬇️
cmd/argocd/commands/admin/cluster.go	0.00% <0.00%> (ø)

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[Fish-pro]

/cc @crenshaw-dev

[Fish-pro]

@crenshaw-dev
The functionality that thegithub.com/pkg/errors provides is already present in golang's builtin errors，and the github repo is now read-only.
So it is suggested to remove the dependency on 'github.com/pkg/errors', please review, thanks

[crenshaw-dev]

@Fish-pro thanks! I'm going to consider this a chore until a fix unless/until a vulnerability or bug appears in github.com/pkg/errors.