Update selected runtime text to match FUNCTIONS_WORKER_RUNTIME dotnet-Isolated

cc @ankitkumarr @fabiocav

Selecting dotnet (Isolated Process) displays the following:

` Use the up/down arrow keys to select a worker runtime:dotnetIsolated`

Recommend updating the text to match the FUNCTIONS_WORKER_RUNTIME value **runtime:dotnet-Isolated**
runtime:dotnetIsolated

Start by locating the CLI prompt that displays the selected dotnet (Isolated Process) runtime and search for the current `dotnetIsolated` text. Update the displayed value to `runtime:dotnet-Isolated`, then verify that selecting this runtime shows the corrected text.

Written by the indexing model from the issue text.