Reflect the latest registry changes in openapi.yaml (#345)

<!-- Provide a brief summary of your changes -->

## Motivation and Context
<!-- Why is this change needed? What problem does it solve? -->
The following PR:
* Adds a new `transport` type used in Package and Remotes
* Added `docker` to the `runtime_hint` examples
* Added support for templated URLs. It is available for streamable-http
and sse transports for Packages. I didn't thought of reasons to have
this for Remotes, but we can enable it if needed.
* Added validation for templated URLs so we can ensure all referenced
placeholder variables are available.
* For streamable-http and SSE transport types the URL is now a required
property
* Updated the publisher init command to reflect these changes
* Updated the seed.json file
* Added unit tests for the transport type related changes
* Updated the server.json schema and the external pkg structs to reflect
the new transport type
* Updated the examples

Thanks to @kkkarthik for spotting it! 🙏 

## How Has This Been Tested?
<!-- Have you tested this in a real application? Which scenarios were
tested? -->
Ran the tests locally

## Breaking Changes
<!-- Will users need to update their code or configurations? -->
Yes

## 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)
- [ ] New feature (non-breaking change which adds functionality)
- [x] 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. -->
- [ ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ ] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

## Additional context
<!-- Add any other context, implementation notes, or design decisions
-->

---------

Signed-off-by: Radoslav Dimitrov <radoslav@stacklok.com>

internal/service/registry_service_test.go

@@ -21,9 +21,9 @@ func TestValidateNoDuplicateRemoteURLs(t *testing.T) {
 			VersionDetail: model.VersionDetail{
 				Version: "1.0.0",
 			},
-			Remotes: []model.Remote{
-				{URL: "https://api.example.com/mcp"},
-				{URL: "https://webhook.example.com/sse"},
+			Remotes: []model.Transport{
+				{Type: "streamable-http", URL: "https://api.example.com/mcp"},
+				{Type: "sse", URL: "https://webhook.example.com/sse"},
 			},
 		},
 		"existing2": {
@@ -32,8 +32,8 @@ func TestValidateNoDuplicateRemoteURLs(t *testing.T) {
 			VersionDetail: model.VersionDetail{
 				Version: "1.0.0",
 			},
-			Remotes: []model.Remote{
-				{URL: "https://api.microsoft.com/mcp"},
+			Remotes: []model.Transport{
+				{Type: "streamable-http", URL: "https://api.microsoft.com/mcp"},
 			},
 		},
 	}
@@ -62,7 +62,7 @@ func TestValidateNoDuplicateRemoteURLs(t *testing.T) {
 				VersionDetail: model.VersionDetail{
 					Version: "1.0.0",
 				},
-				Remotes: []model.Remote{},
+				Remotes: []model.Transport{},
 			},
 			expectError: false,
 		},
@@ -74,9 +74,9 @@ func TestValidateNoDuplicateRemoteURLs(t *testing.T) {
 				VersionDetail: model.VersionDetail{
 					Version: "1.0.0",
 				},
-				Remotes: []model.Remote{
-					{URL: "https://new.example.com/mcp"},
-					{URL: "https://unique.example.com/sse"},
+				Remotes: []model.Transport{
+					{Type: "streamable-http", URL: "https://new.example.com/mcp"},
+					{Type: "sse", URL: "https://unique.example.com/sse"},
 				},
 			},
 			expectError: false,
@@ -89,8 +89,8 @@ func TestValidateNoDuplicateRemoteURLs(t *testing.T) {
 				VersionDetail: model.VersionDetail{
 					Version: "1.0.0",
 				},
-				Remotes: []model.Remote{
-					{URL: "https://api.example.com/mcp"}, // This URL already exists
+				Remotes: []model.Transport{
+					{Type: "streamable-http", URL: "https://api.example.com/mcp"}, // This URL already exists
 				},
 			},
 			expectError: true,
@@ -104,8 +104,8 @@ func TestValidateNoDuplicateRemoteURLs(t *testing.T) {
 				VersionDetail: model.VersionDetail{
 					Version: "1.1.0",
 				},
-				Remotes: []model.Remote{
-					{URL: "https://api.example.com/mcp"}, // Same URL as before
+				Remotes: []model.Transport{
+					{Type: "streamable-http", URL: "https://api.example.com/mcp"}, // Same URL as before
 				},
 			},
 			expectError: false,