Fix/no default selected project on relogin

[thisismayuresh]

This MR fixes issue -

This merge request fixes an issue where, upon deleting the currently selected project, logging out, and then logging back in, no project is selected by default. Instead, the user is presented with the "No Project Selected" state and has to manually select a project.

Changes Made:

• Added a Mongoose delete query to automatically delete the environment related to the project.
• When a user deletes a project, the next available project will be selected and stored in the context.
• Written a migration script for removing the corresponding environment for previous users.

[nx-cloud]

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