chore(linter): Fix linting errors and warnings within the config

- Replace the deprecated exportloopref with copyloopvar
  https://github.com/kyoh86/exportloopref
  https://golangci-lint.run/usage/linters/#exportloopref (No longer available)
  https://golangci-lint.run/usage/linters/#copyloopvar

- mnd.checks is an array
  https://golangci-lint.run/usage/linters/#mnd

- maligned is deprecated and no longer used
  https://golangci-lint.run/usage/configuration/#config-file

- nolintlint.allow-leading-space was dropped some time ago
  golangci/golangci-lint#3063

Signed-off-by: Lee Yarwood <[email protected]>

Author: lyarwood

hack/linter/.golangci.yml

@@ -34,7 +34,11 @@ linters-settings:
     local-prefixes: kubevirt.io/kubevirt
   mnd:
     # don't include the "operation" and "assign"
-    checks: argument,case,condition,return
+    checks:
+      - argument
+      - case
+      - condition
+      - return
     ignored-functions:
       - '^Eventually$'
       - '^EventuallyWithOffset$'
@@ -46,12 +50,9 @@ linters-settings:
       - shadow
   lll:
     line-length: 140
-  maligned:
-    suggest-new: true
   misspell:
     locale: US
   nolintlint:
-    allow-leading-space: true # don't require machine-readable nolint directives (i.e. with no leading space)
     allow-unused: false # report any unused nolint directives
     require-explanation: false # don't require an explanation for nolint directives
     require-specific: false # don't require nolint directives to be specific about which linter is being skipped
@@ -66,10 +67,10 @@ linters:
   disable-all: true
   enable:
     - bodyclose
+    - copyloopvar
     - dogsled
     - dupl
     - errcheck
-    - exportloopref
     - exhaustive
     - funlen
     - gochecknoinits