[Prism] Remove unused code

[damondouglas]

This PR addresses #31793 removing unused code later discovered not needed.

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R: @Abacn added as fallback since no labels match configuration

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[Abacn]

This PR removed tests but the test result report shows test number remains the same as the main branch

Later I realize runners:prism:java:build didn't add to

beam/build.gradle.kts

Line 235 in e8c6a8c

tasks.register("javaPreCommit") {

so the tests never exercised.

I would suggest add dependsOn("runners:prism:java:build") to tasks.register("javaPreCommit") { so we are sure these codes can be safely removed

[github-actions]

Reminder, please take a look at this pr: @Abacn

[Abacn]

Tried to add :runners:prism:java:build to Java PreCommit, there is at least one flaky (2/2) test:

givenPrismLocation404_thenThrows
value of           : getMessage()
expected to contain: NotFoundException
but was            : java.io.IOException: Server returned HTTP response code: 500 for URL: https://example.com/i/dont/exist.zip
	at app//org.apache.beam.runners.prism.PrismLocatorTest.givenPrismLocation404_thenThrows(PrismLocatorTest.java:119)

In general, PrismLocatorTest relies on real URLs (https://github.com/apache/beam/releases/tag/v2.57.0/apache_beam-v2.57.0-prism-darwin-amd64.zip, https://example.com/i/dont/exist.zip) which are not a good unit test. Can we use mock there?

[Abacn]

funny that "fix xxxx" phrase also leads to close a PR, not only an Issue