feat: Add creds for GitHub auth, add "none" auth to publisher (#276)

## Motivation and Context

- Adds credentials for the new MCP Registry Login GitHub Apps (local,
staging, prod)
- Adds support for "none" auth to publisher

## How Has This Been Tested?

- Tested publisher workflows locally
- Unit and integration tests passing

## Breaking Changes

None

## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [x] I have added appropriate error handling
- [x] I have added or updated documentation as needed

---

Merging based on Tadas's approval review, and only making minor docs changes on top of that.

deploy/Pulumi.local.yaml

@@ -1,7 +1,6 @@
 config:
   mcp-registry:environment: local
   mcp-registry:provider: local
-  mcp-registry:githubClientId: test-client-id
-  mcp-registry:githubClientSecret:
-    secure: v1:gt5MBuW7QPiJymkh:1+I2eFChsrUH18cLELq9OAIN94MLH0SldbOuPp2C
+  mcp-registry:githubClientId: Iv23licy3GSiM9Km5jtd
+  mcp-registry:githubClientSecret: 0e8db54879b02c29adef51795586f3c510a9341d
 encryptionsalt: v1:ijIHaqhbXVA=:v1:7voX1Kv+Bunz33iN:fyVHMOhlGIymzJ+ILgUBy3ExTwUUnA==