Add changelog for v1.6.0

[github-actions[bot]]

This PR must be merged before a backport PR will be created.

[github-actions[bot]]

The backport to release/v1.6 failed:

Validation Failed: "Could not resolve to a node with the global id of 'T_kwDOAG3Mbc4AczmP'."

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new branch
git switch --create backport-3327-to-release/v1.6 origin/release/v1.6
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x 283b7c4f031ff8288a02ff44acc1f7d80fed7f35

When the conflicts are resolved, stage and commit the changes:

git add . && git cherry-pick --continue

If you have the GitHub CLI installed:

# Push the branch to GitHub:
git push --set-upstream origin backport-3327-to-release/v1.6
# Create the PR on GitHub
gh pr create --title '[release/v1.6] Add changelog for v1.6.0' --body 'Backport 283b7c4f031ff8288a02ff44acc1f7d80fed7f35 from #3327' --label 'type/docs' --label 'backport' --base release/v1.6 --milestone release/v1.6 --web

Or, if you don't have the GitHub CLI installed (we recommend you install it!):

# Push the branch to GitHub:
git push --set-upstream origin backport-3327-to-release/v1.6

# Create a pull request where the `base` branch is `release/v1.6` and the `compare`/`head` branch is `backport-3327-to-release/v1.6`.

# Remove the local backport branch
git switch main
git branch -D backport-3327-to-release/v1.6