"Alert" component - Actions as named blocks

[didoo]

📌 Summary

As a follow-up of #104 this PR brings in only the relevant changes to the Alert component.

🛠️ Detailed description

In this PR I have:

• added the actions for the Alert component as named block with yielded components
• added showcase for actions
• fixed regex used in the “DummyPlaceholder” (extra)

Notice: the documentation about the actions (API, how to use, etc) will be done in final part of the component implementation, when things are more stable.

---

👀 How to review

👉 Review by files changed (take in account the code has already been reviewed in #104)

Reviewer's checklist:

• +1 Percy if applicable
• Confirm that PR has a changelog update via Changesets if needed

💬 Please consider using conventional comments when reviewing this PR.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 6f1e2cc

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 no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

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

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployments, click below or on the icon next to each commit.

hds-flight-website – ./

🔍 Inspect: https://vercel.com/hashicorp/hds-flight-website/3VYunb7FGnZ4H2tUjkY8f5mjWCRb
✅ Preview: https://hds-flight-website-git-alert-actions-as-named-block-hashicorp.vercel.app

hds-components – ./

🔍 Inspect: https://vercel.com/hashicorp/hds-components/y544LSsraU7iUBspXFK4sPArE1wS
✅ Preview: https://hds-components-git-alert-actions-as-named-block-hashicorp.vercel.app

[amyrlam]

👍

went ahead and rebased, merging into #124, will @ when #124 is done