fix(ci): remove lint check in push

This check while pushing to fork branch always return an error and an error email.
We only allow pr to merge code, it is not mandatory to check in push, so remove it

Signed-off-by: Jiyong Huang <huangjy@emqx.io>

.github/workflows/lint.yaml

@@ -1,12 +1,5 @@
 name: Lint
 on:
-  push:
-    paths:
-      - '**.go'
-      - 'go.mod'
-      - 'go.sum'
-      - 'tools/check/revive.toml'
-      - '.github/workflows/lint.yaml'
   pull_request:
     types: [opened, edited, synchronize, reopened]
     paths: