fix: correct formatting and release version parsing

[zjw1111]

Purpose

Linked issue: N/A

Fix two validation issues introduced by PR #155:

• apply the cmake-format result required by the post-merge pre-commit workflow
• replace the GNU sed-only \+ expressions in both release scripts with portable POSIX awk version parsing for macOS/BSD compatibility

The release-script fix was moved here from PR #157 so both follow-up fixes can be reviewed together.

Failed pre-commit run: https://github.com/apache/paimon-cpp/actions/runs/30010689906

Tests

• pre-commit run --all-files
• bash -n scripts/releasing/create_source_release.sh scripts/releasing/verify_release_candidate.sh
• reproduced the previous empty result with sed --posix
• parsed 0.2.3 from the working tree and Git content with the new awk expression
• created a source archive with create_source_release.sh --version 0.2.3 --git-ref HEAD
• verified the archive with verify_release_candidate.sh --allow-unsigned --skip-rat --skip-build
• git diff --check upstream/main

API and Format

No API, storage format, or protocol changes.

Documentation

No documentation changes.

Generative AI tooling

Generated-by: Codex (GPT-5)

[lxy-9602]

+1