Prepare for 14.0.0~pre2 Release

[azeey]

🎈 Release

Preparation for 14.0.0~pre2 release.

Comparison to 14.0.0-pre1: sdformat14_14.0.0-pre1...sdf14

Needed by <PR(s)>

Checklist

• Asked team if this is a good time for a release
• There are no changes to be ported from the previous major version
• No PRs targeted at this major version are close to getting in
• Bumped minor for new features, patch for bug fixes
• Updated changelog
• Updated migration guide (as needed)
• Link to PR updating dependency versions in appropriate repository in gazebo-release (as needed):

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #1318 (e6b77e0) into sdf14 (aaea4a5) will not change coverage.
The diff coverage is n/a.

❗ Current head e6b77e0 differs from pull request most recent head 1ec92e1. Consider uploading reports for the commit 1ec92e1 to get more accurate results

@@           Coverage Diff           @@
##            sdf14    #1318   +/-   ##
=======================================
  Coverage   87.47%   87.47%           
=======================================
  Files         134      134           
  Lines       17751    17751           
=======================================
  Hits        15528    15528           
  Misses       2223     2223