Re-enable Blazor linting (#1283)

# Pull Request

## 🤨 Rationale

#1280 

## 👩‍💻 Implementation

It looks like a the build agent began pulling in a new version of the
.NET tools. `dotnet --info` prints out this for the CI build:
```
.NET SDKs installed:
  6.0.408 [/usr/share/dotnet/sdk]
  7.0.105 [/usr/share/dotnet/sdk]
  7.0.203 [/usr/share/dotnet/sdk]
  7.0.302 [/usr/share/dotnet/sdk]
```
So I'm guessing that 7.0.302 is causing issues.

I found
[dotnet/format#1800](dotnet/format#1800) which
is pretty close to what we're seeing. [This
comment](dotnet/format#1800 (comment))
makes it sound like there'll be a newer 7.0.3xx version that will fix
this problem, but the issue is still open so I guess that version isn't
out yet.
Also see
[dotnet/format#1834](dotnet/format#1834) and
[dotnet/sdk#32598](dotnet/sdk#32598) which
reference 7.0.302 and the DLL v4.6.0.0 specifically.

Changes in this PR:
- Re-enable Blazor C# linting in package.json
- Add a
[global.json](https://learn.microsoft.com/en-us/dotnet/core/tools/global-json)
file to ensure the `dotnet` commands are using .NET 6.0.xxx tooling.
- This will ensure both the CI and local builds are using the .NET 6 SDK
for the `dotnet` CLI commands
- Add a pipeline step to print out `dotnet --info`, which will print out
all the installed .NET SDK versions, which should make it easier to
debug issues like this in the future
- Update docs to explicitly call out that a .NET SDK install `6.0.202 <=
v < 7` is required
- Update the CI build (`main.yml`) `setup-dotnet` action to refer to
global.json to get the required .NET version to install (so we're not
encoding the required version in multiple places in code)

## 🧪 Testing

CI build + re-built locally.

## ✅ Checklist

- [x] I have updated the project documentation to reflect my changes or
determined no changes are needed.

.github/workflows/main.yml

@@ -26,7 +26,9 @@ jobs:
       # Install dependencies
       - uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: '6.0.x'
+          global-json-file: packages/nimble-blazor/global.json
+      - run: dotnet --info
+        working-directory: packages/nimble-blazor/
       - uses: actions/setup-node@v3
         with:
           node-version: '16'

CONTRIBUTING.md

@@ -22,7 +22,8 @@ This repository uses the following tooling. See below for more info.
 First step in development is to build the monorepo which requires the following to be installed:
 
 - Node.js version 16+ (run `node --version`) and npm version 8+ (run `npm --version`) which can be downloaded from https://nodejs.org/en/download/
-- .NET 6 SDK version 6.0.202+  (run `dotnet --version`) which can be downloaded from https://dotnet.microsoft.com/en-us/download
+- .NET 6 SDK (`6.0.202 <= version < 7`) which can be downloaded from https://dotnet.microsoft.com/en-us/download
+   - Run `dotnet --info` to verify the required version of the SDK is installed. A `v6` install is required, but it's fine if later versions are installed too.
 
 From the `nimble` directory:
 

change/@ni-nimble-blazor-48a8f3aa-cad3-4fc9-8a98-159d24ed56d0.json

@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "Specify .NET 6 via global.json file; re-enable Blazor linting",
+  "packageName": "@ni/nimble-blazor",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

packages/nimble-blazor/CONTRIBUTING.md

@@ -2,7 +2,7 @@
 
 ## Getting Started
 
-If not already done, download and install the .NET 6 SDK version 6.0.202+  (run `dotnet --version`) which can be downloaded from https://dotnet.microsoft.com/en-us/download
+If not already done, download and install the .NET SDK (see [the main contributing doc](/CONTRIBUTING.md) for the required version).
 
 Initialize and build the Nimble monorepo (`npm install` + `npm run build` from the root `nimble` directory) before working with the Blazor codebase.
 

packages/nimble-blazor/README.md

@@ -21,7 +21,7 @@ This repo contains:
         - Visual Studio 2022 ([Enterprise, if available](https://my.visualstudio.com/Downloads?PId=8229)): Choose the "ASP.NET and Web Development" Workload in the installer
         - Ensure Visual Studio is completely up to date (v17.1.6+): In Visual Studio click "Help" then "Check for Updates"
     - **Mac with Visual Studio Code**: Install [Visual Studio Code](https://code.visualstudio.com/) and open it. Open the Extensions pane ("Preferences" >> "Extensions"), and search for / install the `ms-dotnettools.csharp` extension.
-2. .NET 6 SDK: If not already done, download and install the .NET 6 SDK version 6.0.202+  (run `dotnet --version`) which can be downloaded from https://dotnet.microsoft.com/en-us/download
+2. .NET SDK: See [the main contributing doc](/CONTRIBUTING.md) for the required version.
 
 ### Creating a new Blazor project
 

packages/nimble-blazor/global.json

@@ -0,0 +1,7 @@
+{
+  "sdk": {
+    "version": "6.0.202",
+    "allowPrelease": "false",
+    "rollForward": "latestMinor"
+  }
+}

packages/nimble-blazor/package.json

@@ -11,7 +11,7 @@
     "generate-icons:bundle": "rollup --bundleConfigAsCjs --config build/generate-icons/rollup.config.js",
     "generate-icons:run": "node build/generate-icons/dist/index.js",
     "generate-hybrid": "rollup --bundleConfigAsCjs --config build/generate-hybrid/rollup.config.js",
-    "lint": "npm run lint:js",
+    "lint": "npm run lint:cs && npm run lint:js",
     "lint:cs": "dotnet format --verify-no-changes",
     "lint:js": "eslint .",
     "format": "npm run format:cs && npm run format:js",