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GH-38332: [CI][Release] Resolve symlinks in RAT lint (#38337)

### Rationale for this change

Our release script (`dev/release/02-source.sh`) resolves symlinks in source archive but our lint script (`dev/archery/archery/utils/source.py`) doesn't resolve symlinks. So we may detect RAT problem by our CI.

### What changes are included in this PR?

Resolve symlinks in our lint script too.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* Closes: #38332

Lead-authored-by: Sutou Kouhei <kou@clear-code.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Co-authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>