chore: convert changelogs to new format

[acao]

This should be enough to fix the formatting issues with PRs like #1806, we will know after merge

Required because of the transition from lerna publish to changesets

[changeset-bot]

⚠️ No Changeset found

Latest commit: d6bdb15

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes changesets to release 2 packages

Name	Type
@graphiql/toolkit	Minor
graphiql	Patch

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[codecov]

Codecov Report

Merging #1824 (d6bdb15) into main (dd9397e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1824   +/-   ##
=======================================
  Coverage   65.70%   65.70%           
=======================================
  Files          85       85           
  Lines        5106     5106           
  Branches     1631     1631           
=======================================
  Hits         3355     3355           
  Misses       1747     1747           
  Partials        4        4           

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