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MINOR: [Java][CI] Update the order of commands in Java-Jars CI (#43462)

### Rationale for this change

`googletest` is installed by the `Brewfile` associated with cpp not Java. So move the order of uninstalling in that order. 

### What changes are included in this PR?

Change the order of commands to suit the installation objectives. 

### Are these changes tested?

Existing tests. 

### Are there any user-facing changes?

No

Authored-by: Vibhatha Lakmal Abeykoon <vibhatha@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>