update linter config and fix lint issues

[xcoulon]

WARN [lintersdb] The linter "golint" is deprecated (step 2) and deactivated. It should be removed from the list of disabled linters. https://golangci-lint.run/product/roadmap/#linter-deprecation-cycle
WARN [lintersdb] The linter "scopelint" is deprecated (step 2) and deactivated. It should be removed from the list of disabled linters. https://golangci-lint.run/product/roadmap/#linter-deprecation-cycle
WARN [lintersdb] The linter named "megacheck" is deprecated. It has been split into: gosimple, staticcheck, unused.

and

pkg/ioutils/terminal.go:107:51: printf: non-constant format string in call to (*github.com/kubesaw/ksctl/pkg/ioutils.DefaultTerminal).PrintContextSeparatorWithBodyf (govet)
        t.PrintContextSeparatorWithBodyf(string(result), title)
                                                         ^
pkg/cmd/generate/cli_configs.go:252:42: G115: integer overflow conversion uint -> int64 (gosec)
                        ExpirationSeconds: pointer.Int64(int64(tokenExpirationDays * 24 * 60 * 60)),
                                                              ^
pkg/cmd/adm/must_gather_namespace_test.go:97:3: formatter: remove unnecessary fmt.Sprintf (testifylint)
                require.NoError(t, err, fmt.Sprintf("'%s' is missing", filename))

[MatousJobanek]

Thanks

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 69.61%. Comparing base (fd7b434) to head (e430f08).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/cmd/generate/cli_configs.go	50.00%	1 Missing ⚠️
pkg/ioutils/terminal.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #71   +/-   ##
=======================================
  Coverage   69.61%   69.61%           
=======================================
  Files          43       43           
  Lines        2564     2564           
=======================================
  Hits         1785     1785           
  Misses        588      588           
  Partials      191      191           

Files with missing lines	Coverage Δ
pkg/cmd/generate/cli_configs.go	74.65% <50.00%> (ø)
pkg/ioutils/terminal.go	61.11% <0.00%> (ø)