Combine launch.json files for the Bicep project

We've got some config under `src/vscode-bicep/.vscode/launch.json` and some under `.vscode/launch.json`. It would be good to combine the two into the top-level file to avoid having to quit + relaunch VSCode to access the different config.

Compare src/vscode-bicep/.vscode/launch.json with the top-level .vscode/launch.json, beginning by inspecting the launch configurations in both files. Combine the configurations in the top-level file so the Bicep project exposes both sets without quitting and relaunching VSCode, then verify that the available launch options remain accessible.

Written by the indexing model from the issue text.