chore: enable promlinter linter

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

Author: mmorel-35

.golangci.yml

@@ -10,6 +10,7 @@ linters:
     - errorlint
     - gocritic
     - misspell
+    - promlinter
     - testifylint
 
   settings:
@@ -28,6 +29,9 @@ linters:
         - unnamedResult
       enable-all: true
 
+    promlinter:
+      strict: true
+
     testifylint:
       disable:
         - go-require