fix(lint): disables deprecated linters (opendatahub-io#1068)

Removes linters which are not maintained anymore and deprecated. Most
has been replaced with `unused` linter which is enabled by default.

(cherry picked from commit 8e0998f)

.golangci.yml

@@ -56,18 +56,25 @@ linters:
   enable-all: true
   disable:
     - containedctx # detects struct contained context.Context field
+    - deadcode # deprecated
     - depguard # [replaced by gomodguard] checks if package imports are in a list of acceptable packages
     - exhaustruct # Prevents empty struct. We use a lot of these so I think it is safe to disable.c
     - forbidigo
     - gochecknoglobals # Prevents use of global vars.
     - gofumpt
+    - golint # deprecated
     - gomnd # Doesnot allow hardcoded numbers
     - gomoddirectives # Doesnot allow replace in go mod file
-    - mnd
+    - ifshort # deprecated
+    - interfacer
+    - maligned # deprecated
     - nestif
     - nilnil
     - paralleltest # [too many false positives] detects missing usage of t.Parallel() method in your Go test
+    - scopelint # deprecated
+    - structcheck # deprecated
     - tagliatelle
+    - varcheck # deprecated
     - varnamelen # doesnot allow shorter names like c,k etc. But golang prefers short named vars.
     - wsl # [too strict and mostly code is not more readable] whitespace linter forces you to use empty lines
     - wrapcheck # check if this is required. Prevents direct return of err.