Update tasks.json to use IntegrationTests.csproj (#646)

### Motivation and Context
Fix the VSCode tasks for integration tests.

### Description
This commit changes the tasks.json file to use the
IntegrationTests.csproj file instead of the
SemanticKernel.IntegrationTests.csproj file. This is because the
SemanticKernel project has been renamed to IntegrationTests, and the
tasks.json file needs to reflect this change. This affects the test
coverage task, which runs the integration tests and generates a lcov
report. The commit also updates the cwd option to point to the new
project folder.

.vscode/tasks.json

@@ -147,7 +147,7 @@
         "XPlat Code Coverage;Format=lcov",
         "--filter",
         "${input:filter}",
-        "SemanticKernel.IntegrationTests.csproj"
+        "IntegrationTests.csproj"
       ],
       "problemMatcher": "$msCompile",
       "group": "test",
@@ -156,7 +156,7 @@
         "panel": "shared"
       },
       "options": {
-        "cwd": "${workspaceFolder}/dotnet/src/SemanticKernel.IntegrationTests/"
+        "cwd": "${workspaceFolder}/dotnet/src/IntegrationTests/"
       }
     },
     {