remove style jobs and cleanup makefile gofmt and goimports are running already with golangci-lint

[cpanato]

Summary

• remove style jobs and cleanup makefile gofmt and goimports are running already with golangci-lint
• update golangci-lint

also:
Fixes: #2084

Release Note

n/a

Documentation

n/a

[codecov-commenter]

Codecov Report

Merging #2105 (1850dec) into main (3a6088d) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2105      +/-   ##
==========================================
- Coverage   26.33%   26.27%   -0.07%     
==========================================
  Files         129      129              
  Lines        7564     7574      +10     
==========================================
- Hits         1992     1990       -2     
- Misses       5317     5329      +12     
  Partials      255      255              

Impacted Files	Coverage Δ
pkg/policy/eval.go	78.94% <0.00%> (-0.54%)	⬇️
pkg/cosign/rego/rego.go	70.96% <0.00%> (-0.47%)	⬇️
cmd/cosign/cli/sign/sign.go	14.57% <0.00%> (-0.13%)	⬇️
pkg/cosign/fetch.go	0.00% <0.00%> (ø)
cmd/cosign/cli/sign.go	0.00% <0.00%> (ø)
cmd/cosign/cli/options/sign.go	0.00% <0.00%> (ø)
cmd/cosign/cli/options/attest.go	0.00% <0.00%> (ø)

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[cpanato]

running locally i dont see this error

$ /Users/cpanato/code/src/github.com/sigstore/cosign/bin/golangci-lint version
golangci-lint has version v1.47.2 built from (unknown, mod sum: "h1:qvMDVv49Hrx3PSEXZ0bD/yhwSbhsOihQjFYCKieegIw=") on (unknown)

$ /Users/cpanato/code/src/github.com/sigstore/cosign/bin/golangci-lint run --out-format=github-actions --timeout=5m
WARN [linters context] structcheck is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] tparallel is disabled because of go1.18. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.