[chore][cmd/otelcontribcol] Exclude from linter (open-telemetry#27865)

**Description:**
The linter runs are taking longer and longer as more components and
dependencies are added, it's preferable to simply run on each individual
component.

**Link to tracking Issue:** 
Related: open-telemetry#27850

.golangci.yml

@@ -19,6 +19,7 @@ run:
   skip-dirs:
     - third_party
     - local
+    - cmd/otelcontribcol
 
   # default is true. Enables skipping of directories:
   #   vendor$, third_party$, testdata$, examples$, Godeps$, builtin$