Upgrade to golangci-lint v2 for improved linting

Noteworthy changes in golangci-lint v2:

* New config format (migrated with `migrate` command)
* Default timeout is now 0 instead of 1 minute.

Author: jorbaum

scripts/subtests/lint

@@ -9,7 +9,7 @@ set +e
 golangci_lint_executable=$(which golangci-lint)
 set -e
 if [ -z "${golangci_lint_executable}" ] || [ ! -x "${golangci_lint_executable}" ]; then
-  go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
+  go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@latest
 fi
 
 pushd "${SCRIPT_DIR}/../../src" > /dev/null

src/.golangci.yml

@@ -1,3 +1,5 @@
+version: "2"
+
 run:
   # Timeout for analysis, e.g. 30s, 5m.
   # Default: 1m
@@ -11,11 +13,31 @@ linters:
     - gocyclo
     # Inspects source code for security problems.
     - gosec
-    # Checks code formatting
-    - goimports
+  exclusions:
+    generated: lax
+    presets:
+      - comments
+      - common-false-positives
+      - legacy
+      - std-error-handling
+    paths:
+      - third_party$
+      - builtin$
+      - examples$
 
 issues:
   # Disable max issues per linter.
   max-issues-per-linter: 0
   # Disable max same issues.
   max-same-issues: 0
+
+formatters:
+  enable:
+    # Checks code formatting
+    - goimports
+  exclusions:
+    generated: lax
+    paths:
+      - third_party$
+      - builtin$
+      - examples$