Alert users on deployment when the runtime of their project doesn't match their web app

[v-xinda]

OS: All
Azure Resources Build Link: vscode-azuresourcegroups-0.8.1-alpha.2 1.vsix
App Service Version: v0.25.1
.NET Core version: 8.0.100-rc.1.23463.5
Regression: Not a regression

Repro Steps:

1. Create a .NET Core project using dotnet new web and open it in VSCode.
2. Create a .NET 6 Linux web app -> Deploy the above project to it -> Click "Browse Website".
3. Check whether the webpage shows correctly.

Expect:
The webpage shows correctly.

Actual:
The webpage shows incorrectly.

More Info:

1. This issue doesn't reproduce for the .NET Windows web app.
2. This issue doesn't reproduce for the .NET 8 Linux web app.
3. This issue also reproduces for the .NET 7 Linux web app.
4. This issue also reproduces after deploying a python project to the Python web app.