Update examples and tutorials

Motivation:

We're going to tag beta.1 soon, so the examples and tutorials need to be
updated to reflect this.

Modifications:

- Regenerate example code
- Update example code to use new APIs
- Update example manifests to use the as-yet-unreleased beta.1 tag of
  each dependency

Result:

Examples are up-to-date

Author: glbrntt

Examples/echo/Package.swift

@@ -21,10 +21,10 @@ let package = Package(
   name: "echo",
   platforms: [.macOS("15.0")],
   dependencies: [
-    .package(url: "https://github.com/grpc/grpc-swift", exact: "2.0.0-alpha.1"),
-    .package(url: "https://github.com/grpc/grpc-swift-protobuf", exact: "1.0.0-alpha.1"),
-    .package(url: "https://github.com/grpc/grpc-swift-nio-transport", branch: "1.0.0-alpha.1"),
-    .package(url: "https://github.com/apple/swift-argument-parser", from: "1.5.0"),
+    .package(url: "https://github.com/grpc/grpc-swift.git", exact: "2.0.0-beta.1"),
+    .package(url: "https://github.com/grpc/grpc-swift-protobuf.git", exact: "1.0.0-beta.1"),
+    .package(url: "https://github.com/grpc/grpc-swift-nio-transport.git", branch: "1.0.0-beta.1"),
+    .package(url: "https://github.com/apple/swift-argument-parser.git", from: "1.5.0"),
   ],
   targets: [
     .executableTarget(

Examples/hello-world/Package.swift

@@ -21,10 +21,10 @@ let package = Package(
   name: "hello-world",
   platforms: [.macOS("15.0")],
   dependencies: [
-    .package(url: "https://github.com/grpc/grpc-swift", exact: "2.0.0-alpha.1"),
-    .package(url: "https://github.com/grpc/grpc-swift-protobuf", exact: "1.0.0-alpha.1"),
-    .package(url: "https://github.com/grpc/grpc-swift-nio-transport", exact: "1.0.0-alpha.1"),
-    .package(url: "https://github.com/apple/swift-argument-parser", from: "1.5.0"),
+    .package(url: "https://github.com/grpc/grpc-swift.git", exact: "2.0.0-beta.1"),
+    .package(url: "https://github.com/grpc/grpc-swift-protobuf.git", exact: "1.0.0-beta.1"),
+    .package(url: "https://github.com/grpc/grpc-swift-nio-transport.git", exact: "1.0.0-beta.1"),
+    .package(url: "https://github.com/apple/swift-argument-parser.git", from: "1.5.0"),
   ],
   targets: [
     .executableTarget(

Examples/route-guide/Package.swift

@@ -21,10 +21,10 @@ let package = Package(
   name: "route-guide",
   platforms: [.macOS("15.0")],
   dependencies: [
-    .package(url: "https://github.com/grpc/grpc-swift", exact: "2.0.0-alpha.1"),
-    .package(url: "https://github.com/grpc/grpc-swift-protobuf", exact: "1.0.0-alpha.1"),
-    .package(url: "https://github.com/grpc/grpc-swift-nio-transport", exact: "1.0.0-alpha.1"),
-    .package(url: "https://github.com/apple/swift-argument-parser", from: "1.5.0"),
+    .package(url: "https://github.com/grpc/grpc-swift.git", exact: "2.0.0-beta.1"),
+    .package(url: "https://github.com/grpc/grpc-swift-protobuf.git", exact: "1.0.0-beta.1"),
+    .package(url: "https://github.com/grpc/grpc-swift-nio-transport.git", exact: "1.0.0-beta.1"),
+    .package(url: "https://github.com/apple/swift-argument-parser.git", from: "1.5.0"),
   ],
   targets: [
     .executableTarget(