Release: Fix minor scripts and workflows

[JReinhold]

Follow-up to #22959, that fixes a lot of things discovered while looking at the workflow runs.

What I did

• When looking for changes use --first-parent, so we only consider commits on the actual branch, and not any commits within the feature branches
• Set maxBatchSize: 50 for the dataloader, so we batch requests to GitHub into 50 commits at a time. Should hopefully decrease the timeout
• Install code dependencies in the workflows, so we use the local version of lerna.

How to test

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• If this PR should be tested against many or all sandboxes,
  make sure to add the ci:merged or ci:daily GH label to it.
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "documentation", "maintenance", "dependencies", "other"]

[JReinhold]

this is the only difference to this file

[JReinhold]

Self-merging to unblock unit tests on next.