feat: able to specify the context inline on a command

[Prashidha0O1]

Add ability to specify context inline on commands

This PR addresses issue Qovery#158 by implementing the ability to specify context inline on shell commands, which makes it faster and more convenient for users who manage multiple instances/environments.

Changes

• Added a new --context flag to the shell command that accepts a string in the format organization:project:environment:service
• Added the necessary conditional logic in the command execution flow to prioritize the inline context flag
• Updated the command examples to include the new usage pattern

Usage

Users can now run commands like:

qovery shell --context webapp:staging:web
qovery shell -c bash --context webapp:production:worker

This eliminates the need to go through interactive menu selections when the context is already known.