Fail to debug a C# function project with an error "Failed to detect azFunctions Task"

[v-meilei]

OS: All
Build Version: v1.15.5-alpha.0
.NET Version: 8.0.403
Regression: Previous release(v1.15.4)

Repro Steps:

1. Create and open a .NET 8.0 C# project with "HTTP trigger" function.
2. Debug the above project.
3. Check whether succeeds to debug the C# project or not.

Expect:
Succeed to debug the C# project without any error.

Actual:
Fail to debug the C# project with an error "Failed to detect AzFunctions Task".

More Info:
This issue also reproduces when debugging a .NET 9.0/7.0 C# project.

[nturinski]

This issue also reproduces on the current released Function extension v1.15.4.

This seems to work fine on v1.15.4 for me. I think this was introduced later.

[v-meilei]

This issue also reproduces on the current released Function extension v1.15.4.

This seems to work fine on v1.15.4 for me. I think this was introduced later.

Sorry for my mistake, this issue doesn't reproduce on v1.15.4. I‘ve updated the bug content.

[nturinski]

Fixed by #4320