ci: bump to golangci-lint v2.0

The new configuration file was initially generated by golangci-lint
migrate, when tweaked to minimize and simplify.

golangci-lint v2 switches to a new version of staticcheck which shows
much more warnings. Some of them were fixed by a few previous commits,
and the rest of them are disabled.

In particular, ST1005 had to be disabled (an attempt to fix it was made
in https://github.com/opencontainers/runc/pull/3857 but it wasn't
merged).

Also, golangci-extra was modified to include ALL staticcheck linters.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

.golangci.yml

@@ -1,18 +1,30 @@
-# For documentation, see https://golangci-lint.run/usage/configuration/
+version: "2"
 
 run:
   build-tags:
     - seccomp
 
-linters:
+formatters:
   enable:
     - gofumpt
+
+linters:
+  enable:
     - errorlint
     - nolintlint
     - unconvert
     - unparam
-
-linters-settings:
-  govet:
-    enable:
-      - nilness
+  settings:
+    govet:
+      enable:
+        - nilness
+    staticcheck:
+      checks:
+        - all
+        - -ST1000 # https://staticcheck.dev/docs/checks/#ST1000 Incorrect or missing package comment.
+        - -ST1003 # https://staticcheck.dev/docs/checks/#ST1003 Poorly chosen identifier.
+        - -ST1005 # https://staticcheck.dev/docs/checks/#ST1005 Incorrectly formatted error string.
+        - -QF1008 # https://staticcheck.dev/docs/checks/#QF1008 Omit embedded fields from selector expression.
+  exclusions:
+    presets:
+      - std-error-handling