Fix flaky precommit java test on prism caused by PR 35202

[shunping]

Get back #35202 (reverted at #35306) and fix the type assertion issue that causes PreCommit Java test failure.

fixes#35233

The original error can be reproduced by the simple code below:

package main
import"fmt"funcmain() {
varmmap[string]interface{}
v:=m["foo"].([]interface{})
fmt.Println(v)
}

By adding the ok returned value for type assertion, the error is not raised and ok is False in this case.

package main
import"fmt"funcmain() {
varmmap[string]interface{}
v, ok:=m["foo"].([]interface{})
fmt.Println(v, ok)
}

[shunping]

cc'ed @Abacn@Amar3tto

[shunping]

The PreCommit Java test is green (https://github.com/apache/beam/actions/runs/15715290813).

[lostluck]

LGTM