[CI] fix some tests scope (verl-project#1689)

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### What does this PR do?

Refactor and reduce some tests scope to reduce unrelated tests.

### High-Level Design

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### Specific Changes

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### API

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### Usage Example

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```python
# Add code snippet or script demonstrating how to use this 
```

### Test

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### Additional Info.

- **Issue Number**: Fixes issue # or discussion # if any.
- **Training**: [Note which backend this PR will affect: FSDP, Megatron,
both, or none]
- **Inference**: [Note which backend this PR will affect: vLLM, SGLang,
both, or none]

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Author: ETOgaosion

.github/workflows/checkpoint_converter.yml

@@ -14,15 +14,22 @@ on:
       - v0.*
     paths:
       - "**/*.py"
-      # Entrypoints
-      - ".github/workflows/checkpoint_converter.yml"
-      - "!examples"
+      # Other entrypoints
+      - "!examples/**"
+      - "!tests/**"
       - "!verl/trainer/main_*.py"
       - "!verl/trainer/fsdp_sft_trainer.py"
       # Recipes
-      - "!recipe"
+      - "!recipe/**"
       # FSDP
       - "!verl/workers/**/*dp_*.py"
+      # Entrypoints
+      - ".github/workflows/checkpoint_converter.yml"
+      - ".github/workflows/e2e_ppo_trainer_megatron.yml"
+      - "examples/data_preprocess/gsm8k.py"
+      - "tests/e2e/run_ppo_trainer_megatron.sh"
+      - "verl/trainer/main_ppo.py"
+      - "verl/trainer/config/ppo_megatron_trainer.yaml"
 
 
 # Cancel jobs on the same ref if a new one is triggered

.github/workflows/kernels.yml

@@ -17,9 +17,16 @@ on:
       - v0.2.x
     paths:
       - "**/*.py"
-      - "verl/trainer/config/*.yaml"
+      # Other entrypoints
+      - "!examples/**"
+      - "!tests/**"
+      - "!verl/trainer/main_*.py"
+      - "!verl/trainer/fsdp_sft_trainer.py"
+      # Recipes
+      - "!recipe/**"
+      # Entrypoints
       - .github/workflows/kernels.yml
-      - "tests/e2e/*.sh"
+      - "tests/kernels/*"
 
 # Cancel jobs on the same ref if a new one is triggered
 concurrency: