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GH-37120: [CI][Docs] Ensure removing existing Node.js (#37121)

### Rationale for this change

We want to use the specified Node.js and existing Node.js may be conflicted.

### What changes are included in this PR?

We remove existing Node.js explicitly before we install the specified Node.js. 

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* Closes: #37120

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>