Update release workflows

[Alia5]

• Remove superfluous duplicated content
• Fix changelog-Markdown heading levels

[Copilot]

Pull request overview

This PR refactors the release workflows to eliminate redundant information and standardize Markdown heading structure in generated changelogs.

• Removes duplicate version/date information from release bodies that was already present in release titles
• Updates changelog script to use proper nested heading levels (## for main title, ### for subsections)
• Improves release naming consistency by including the full package name

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.github/workflows/snapshots.yml	Removes duplicate version/date/time fields and redundant "### Changes" heading from snapshot release body
.github/workflows/release.yml	Updates release name to include full package name and removes duplicate title, date, and heading from release body
.github/scripts/generate-changelog.sh	Adjusts Markdown heading levels from # to ## for main changelog title and ## to ### for feature/fix/misc sections

The changes are well-coordinated across all three files and successfully achieve the stated goals of removing duplication and fixing heading levels. No issues were identified during the review.

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