Refactor CI workflow (#4912)

- merge image build workflow into one
- merge package build workflow into one
- merge community related workflow into one

This change makes the workflow more clear

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

.github/workflows/label_merge_conflict.yml

@@ -1,4 +1,4 @@
-name: "Merge Conflict Labeler"
+name: Lint
 on:
   # So that PRs touching the same files as the push are updated
   push:
@@ -10,6 +10,7 @@ on:
 
 jobs:
   main:
+    name: Merge Conflict Labeler
     runs-on: ubuntu-latest
     steps:
       - name: check if prs are dirty