feat: add GitHubPullRequestWorkflow

[DavieReid]

Create a new workflow that creates Github pull requests, similar to the Bitbucket pull request workflow.

A fine-grained github pat token is required to authorise the github client used to make the github api requests.

[changeset-bot]

🦋 Changeset detected

Latest commit: 99ae3dc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 28 packages

Name	Type
@jpmorganchase/mosaic-cli	Patch
@jpmorganchase/mosaic-schemas	Patch
@jpmorganchase/mosaic-site	Patch
@jpmorganchase/mosaic-types	Patch
@jpmorganchase/mosaic-workflows	Patch
@jpmorganchase/mosaic-labs-components	Patch
@jpmorganchase/mosaic-components	Patch
@jpmorganchase/mosaic-content-editor-plugin	Patch
@jpmorganchase/mosaic-core	Patch
@jpmorganchase/mosaic-create-site	Patch
@jpmorganchase/mosaic-from-http-request	Patch
@jpmorganchase/mosaic-layouts	Patch
@jpmorganchase/mosaic-open-api-component	Patch
@jpmorganchase/mosaic-plugins	Patch
@jpmorganchase/mosaic-serialisers	Patch
@jpmorganchase/mosaic-site-components	Patch
@jpmorganchase/mosaic-site-middleware	Patch
@jpmorganchase/mosaic-site-preset-styles	Patch
@jpmorganchase/mosaic-sitemap-component	Patch
@jpmorganchase/mosaic-source-figma	Patch
@jpmorganchase/mosaic-source-git-repo	Patch
@jpmorganchase/mosaic-source-http	Patch
@jpmorganchase/mosaic-source-local-folder	Patch
@jpmorganchase/mosaic-source-readme	Patch
@jpmorganchase/mosaic-source-storybook	Patch
@jpmorganchase/mosaic-standard-generator	Patch
@jpmorganchase/mosaic-store	Patch
@jpmorganchase/mosaic-theme	Patch

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Name	Status	Preview	Comments	Updated (UTC)
mosaic	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 5, 2024 8:05am