Misc optimizations

[mcollier]

This PR includes the following changes: This pull request includes a variety of changes to improve the development environment and configuration of the project. The most important changes include updating the dev container configuration to remove unnecessary features and add necessary ones, and adding a script to set up the local.settings.json file for the workflow designer.

Development environment improvements:

• .devcontainer/devcontainer.json: Updated the dev container configuration to remove unnecessary features and add necessary ones, including setting up the local.settings.json file.
• .devcontainer/Dockerfile: Removed commented-out lines in .devcontainer/Dockerfile that enabled the Development Container Script.
• .devcontainer/scripts/setup-local-settings.sh: Added a script to set up the local.settings.json file for the workflow designer.

Configuration improvements:

• source/workflow-designtime/starter.settings.json: Removed environment variables and changed the ProjectDirectoryPath to point to the root of the project.
• source/starter.settings.json: Added default settings file for project.
• .vscode/launch.json: Renamed launch configuration for attaching to a process.

Documentation improvements:

• README.md: Added a note about opening the included Logic App workflow in the designer before attempting to debug the Logic App.

Code cleanup:

• source/.gitignore: Removed unnecessary files and directories from the .gitignore file in the source directory.