### Why are the changes needed?
Followup for #7034 to fix the SparkOnKubernetesTestsSuite.
Sorry, I forget that the appInfo name and pod name were deeply bound before, the appInfo name was used as pod name and used to delete pod.
In this PR, we add `podName` into applicationInfo to separate app name and pod name.
### How was this patch tested?
GA should pass.
### Was this patch authored or co-authored using generative AI tooling?
No.
Closes#7039 from turboFei/fix_test.
Closes#7034
0ff7018d6 [Wang, Fei] revert
18e48c079 [Wang, Fei] comments
19f34bc83 [Wang, Fei] do not get pod name from appName
c1d308437 [Wang, Fei] reduce interval for test stability
50fad6bc5 [Wang, Fei] fix ut
Authored-by: Wang, Fei <fwang12@ebay.com>
Signed-off-by: Wang, Fei <fwang12@ebay.com>
75891d1a92