[SPARK-35388][INFRA] Allow the PR source branch to include slashes
[SPARK-35388][INFRA] Allow the PR source branch to include slashes

### What changes were proposed in this pull request?

This PR allows the PR source branch to include slashes.

### Why are the changes needed?

There are PRs whose source branches include slashes, like `issues/SPARK-35119/gha` here or #32523.

Before the fix, the PR build fails in `Sync the current branch with the latest in Apache Spark` phase.
For example, at #32523, the source branch is `issues/SPARK-35382/nested_higher_order_functions`:

```
...
fatal: couldn't find remote ref nested_higher_order_functions
Error: Process completed with exit code 128.
```

(https://github.com/ueshin/apache-spark/runs/2569356241)

### Does this PR introduce _any_ user-facing change?

No, this is a dev-only change.

### How was this patch tested?

This PR source branch includes slashes and #32525 doesn't.

Closes #32524 from ueshin/issues/SPARK-35119/gha.

Authored-by: Takuya UESHIN <f070f8f0c50caeda5841963fc7b57e73e59dad56@databricks.com>
Signed-off-by: Hyukjin Kwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

chuckchen/spark,jiangxb1987/spark,vinodkc/spark,milliman/spark,cloud-fan/spark,gengliangwang/spark,holdenk/spark,gengliangwang/spark,hvanhovell/spark,xuanyuanking/spark,wangyum/spark,rednaxelafx/apache-spark,WeichenXu123/spark,gengliangwang/spark,shaneknapp/spark,zero323/spark,HyukjinKwon/spark,holdenk/spark,gengliangwang/spark,wangmiao1981/spark,JoshRosen/spark,mahak/spark,chuckchen/spark,wangmiao1981/spark,ueshin/apache-spark,dongjoon-hyun/spark,taroplus/spark,chuckchen/spark,zero323/spark,zzcclp/spark,taroplus/spark,holdenk/spark,srowen/spark,hvanhovell/spark,shaneknapp/spark,cloud-fan/spark,witgo/spark,wangmiao1981/spark,ueshin/apache-spark,apache/spark,zzcclp/spark,holdenk/spark,mahak/spark,dongjoon-hyun/spark,cloud-fan/spark,hvanhovell/spark,HyukjinKwon/spark,zero323/spark,rednaxelafx/apache-spark,HyukjinKwon/spark,jiangxb1987/spark,nchammas/spark,dongjoon-hyun/spark,WeichenXu123/spark,jiangxb1987/spark,wangyum/spark,maropu/spark,zero323/spark,maropu/spark,mahak/spark,zzcclp/spark,rednaxelafx/apache-spark,vinodkc/spark,taroplus/spark,ueshin/apache-spark,chuckchen/spark,ueshin/apache-spark,zzcclp/spark,shaneknapp/spark,ueshin/apache-spark,zero323/spark,hvanhovell/spark,wangyum/spark,rednaxelafx/apache-spark,rednaxelafx/apache-spark,JoshRosen/spark,srowen/spark,apache/spark,taroplus/spark,apache/spark,wangyum/spark,chuckchen/spark,witgo/spark,maropu/spark,milliman/spark,dongjoon-hyun/spark,JoshRosen/spark,jiangxb1987/spark,hvanhovell/spark,vinodkc/spark,taroplus/spark,mahak/spark,WeichenXu123/spark,witgo/spark,holdenk/spark,witgo/spark,chuckchen/spark,dongjoon-hyun/spark,HyukjinKwon/spark,nchammas/spark,nchammas/spark,witgo/spark,WeichenXu123/spark,dongjoon-hyun/spark,JoshRosen/spark,xuanyuanking/spark,hvanhovell/spark,vinodkc/spark,maropu/spark,srowen/spark,chuckchen/spark,gengliangwang/spark,zzcclp/spark,shaneknapp/spark,zzcclp/spark,xuanyuanking/spark,maropu/spark,maropu/spark,WeichenXu123/spark,HyukjinKwon/spark,mahak/spark,taroplus/spark,xuanyuanking/spark,shaneknapp/spark,JoshRosen/spark,nchammas/spark,jiangxb1987/spark,taroplus/spark,zzcclp/spark,wangmiao1981/spark,apache/spark,vinodkc/spark,witgo/spark,ueshin/apache-spark,zero323/spark,mahak/spark,rednaxelafx/apache-spark,JoshRosen/spark,mahak/spark,milliman/spark,shaneknapp/spark,gengliangwang/spark,nchammas/spark,apache/spark,wangmiao1981/spark,cloud-fan/spark,ueshin/apache-spark,HyukjinKwon/spark,wangmiao1981/spark,wangyum/spark,witgo/spark,srowen/spark,rednaxelafx/apache-spark,holdenk/spark,srowen/spark,cloud-fan/spark,srowen/spark,xuanyuanking/spark,vinodkc/spark,nchammas/spark,xuanyuanking/spark,dongjoon-hyun/spark,xuanyuanking/spark,vinodkc/spark,hvanhovell/spark,WeichenXu123/spark,milliman/spark,shaneknapp/spark,WeichenXu123/spark,zero323/spark,JoshRosen/spark,nchammas/spark,apache/spark,apache/spark,srowen/spark,milliman/spark,gengliangwang/spark,milliman/spark,wangmiao1981/spark,jiangxb1987/spark,cloud-fan/spark,HyukjinKwon/spark,holdenk/spark,maropu/spark,jiangxb1987/spark,wangyum/spark,cloud-fan/spark,milliman/spark,wangyum/spark