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GH-36947: [CI] Move free up disk space to the Jinja macros to be able to reuse it on docs job (#36948)

### Rationale for this change

Try to get rid of some failures on docs generation on release and reuse existing code.

### What changes are included in this PR?

Move step to a macro to be able to reuse it

### Are these changes tested?

Archery tasks

### Are there any user-facing changes?

No
* Closes: #36947

Authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>