[ci] Disable flaky Java RPC tests

[driazati]

See #13168

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• cc @Mousius, @areusch, @gigiblender _{See #10317 for details}
• Built docs for commit 5edee04 can be found here.
• This PR had no significant effect on CI runtime: -6.66% (151.77m -> 141.66m)

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