Remove alpha release mode

[carterworks]

Description

• Delete the "beta" merge guard - any change can be merged whenever, without being blocked.
• Remove the "alpha" release process. "beta" is now the default, continual deployment state. After a stable release, we will go back to beta.
• Remove the changeset-status.json file and prevent it from being committed in the future.

Related Issue

Motivation and Context

Screenshots (if appropriate):

Checklist:

• I have signed the Adobe Open Source CLA or I'm an Adobe employee.
• I have made any necessary test changes and all tests pass.
• I have run the Sandbox successfully.
• I have added a Changeset (pnpm changeset) or it is not necessary because this PR is not consumer-facing.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 05dc91f

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

[carterworks]

I have also modified the wiki page - https://github.com/adobe/alloy/wiki/Release-process

[carterworks]

Note that the recommendation is "If you want your change to be published, it needs a non-empty changeset file"