Can't save proof with long package name as proof bundle

[FliegendeWurst]

Description

If a proof name contains very long package names, it can't be saved as a proof bundle (.zproof).

Reproducible

always

Steps to reproduce

1. Load and prove the method below
2. Try to save as proof bundle

package very.large.path.with.lots.of.members;

class LongMethodName {
    /*@ public normal_behaviour
      @ ensures \result == 100;
      @*/
    public int doIt(LongMethodName a, LongMethodName b, LongMethodName c) {
        return 100;
    }
}

Expected behaviour: it works
Actual behaviour: it fails with an exception

Additional information

[15:45:17.768] WARN  ProofSaver - Failed to save java.io.FileNotFoundException: /tmp/KeYTmpFileRepo15620876094854547731/very.large.path.with.lots.of.members.LongMethodName(very.large.path.with.lots.of.members.LongMethodName__doIt(very.large.path.with.lots.of.members.LongMethodName,very.large.path.with.lots.of.members.LongMethodName,very.large.path.with.lots.of.members.LongMethodName)).JML normal_behavior operation contract.0.proof (File name too long)
        at java.base/java.io.FileOutputStream.open0(Native Method)
        at java.base/java.io.FileOutputStream.open(FileOutputStream.java:289)
        at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:230)
        at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:179)
        at de.uka.ilkd.key.proof.io.consistency.DiskFileRepo.createOutputStream(DiskFileRepo.java:271)
        at de.uka.ilkd.key.proof.io.ProofBundleSaver.save(ProofBundleSaver.java:57)
        at de.uka.ilkd.key.proof.io.ProofSaver.save(ProofSaver.java:127)
        at de.uka.ilkd.key.gui.WindowUserInterfaceControl.saveProofBundle(WindowUserInterfaceControl.java:430)
        at de.uka.ilkd.key.gui.actions.ShowProofStatistics$Window.lambda$init$4(ShowProofStatistics.java:311)
        at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1972)

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• Commit: ec5929d (on JML proof scripts branch, but the issue occurs on main as well)