[WebToolsE2E][docs] Do the samples need to be updated to NET9? Because existing .NET applications (NET8.0) cannot reference .NET Aspire 9.

[v-sherryfan]

Describe the issue or suggestion

Issue description: In Tutorial: Add .NET Aspire to an existing .NET app doc, we need to make some updates to the instructions.

Issue 1:

• For eShopLite sample, Do we need to add support for aspire9? Its default target is 8.0, but we have supported aspire9 templates for some time. If users use CLI to create aspire templates according to the documentation, the highest version of aspire9 will be created by default (assuming that the user has an aspire9 environment), which will not match the samples version.

Issue 2:

• The .NET CLI part of the document also needs to add aspire9 related instructions

Issue 3:

• For step 3 in this Explore the sample app section, do we need to add instructions to navigate to /api/Product? Actual: Expected:

[maddymontaquila]

@v-sherryfan can you try again but let the terminal live a bit longer? That localhost issue happens when the dashboard hasn't fully spun up yet. Aspire 9 should work with .NET 8 projects.