Release notes should not include PRs

[npatki]

Problem Description

We currently have an automated script that creates the release notes for each SDV release. This script is meant to mention all issues that we've included in the release (based off the milestone), and sort them as feature request, bug, or miscellaneous based on the tag.

But in practice, we see that the "Miscellaneous" section actually contains PRs, not issues. This is confusing because each PR should already be attached to an issue -- meaning that the bug or feature it represents is already included in the release notes. It leads to doubly mentioning the bug or feature.

Eg. In the 1.14.0 release notes we see PR #2043 linked under Miscellaneous. But this PR is fixing issue #2031 which is already listed under bugs.

Expected behavior

• Only issues should be tagged in the release notes, not PRs
• The Miscellaneous section should only include issues that are NOT tagged as feature request or bug