docs(release): add synopsis and examples to release commands

Description

Resolves the release family findings from the style guide audit in #8263 (closed).

• Adds Long (Synopsis) fields to the release parent command and the release list subcommand, and adds an Examples section to release list.
• Adds a Synopsis note to release create explaining that the --publish-to-catalog flag is experimental and not ready for production use.
• Fixes the release upload --assets-links flag description so the trailing period falls outside the inline code span.

Each Synopsis is additive and does not repeat the Short description. The release parent command's help test was updated to match the rendered Synopsis (Cobra renders Long in place of Short once Long is set).

Commands updated:

• release
• release list
• release create
• release upload

Content follows the documentation style guide and the GitLab CLI (glab) documentation style guide.

Related issues and merge requests

• docs: Fix CLI documentation inconsistencies ide... (#8263 - closed)

Documentation

If this MR adds or updates CLI command documentation, follow the conventions in the GitLab CLI (glab) documentation style guide, run make gen-docs, and commit the updated files in docs/source/.