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"

func main() {
	var m map[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"

func main() {
	var m map[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