Enable the sloglint linter (#34398)

Updates the golangci-lint configuration to enable sloglint and
configure it as per RFD 0154.

.golangci.yml

@@ -27,6 +27,7 @@ linters:
     - misspell
     - nolintlint
     - revive
+    - sloglint
     - staticcheck
     - testifylint
     - unconvert
@@ -72,6 +73,10 @@ linters-settings:
     rules:
     - name: unused-parameter
       disabled: true
+  sloglint:
+    context-only: true
+    key-naming-case: snake
+    static-msg: true
   testifylint:
     enable:
       - bool-compare