Updates the Java Expansion Service container to support gRPC ALTS authentication

[chamikaramj]

For more details on ALTS, please see https://grpc.io/docs/languages/java/alts/.

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[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[chamikaramj]

assign set of reviewers

[github-actions]

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R: @Abacn for label java.
R: @ahmedabu98 for label io.

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[Abacn]

Thanks, just have one comment about the pipeline option description

JavaPreCommit two attempts failed with different unrelated tests, so the test result is good

[chamikaramj]

Thanks! Updated the description and the PR title.

[Abacn]

thanks!