Update applications add and remove

[callmevladik]

The process for selecting a codebase during the Deployments Flow creation presents a lengthy list of branches, which becomes cumbersome with a significant number of branches. This task aims to enhance the user experience by introducing a flexible list and search feature for codebase selection, akin to the functionality for pipeline settings on codebasebranch. This improvement will allow users to efficiently search for and select the desired branch, streamlining the selection process.

Acceptance Criteria
A flexible list and search feature is implemented for codebase selection in the Deployments Flow creation process.
Users can efficiently search for and select branches, improving the usability of the selection process.
The implementation aligns with the approach used for pipeline settings on codebasebranch, ensuring consistency in user experience.
The feature is thoroughly tested to ensure functionality across all supported browsers and devices.
Documentation and user guides are updated to reflect the new codebase selection feature and provide instructions on its use.
Implementation Plan
Review the current codebase selection process in the Deployments Flow creation for usability enhancements.
Design and develop the flexible list and search feature, drawing inspiration from the solution for pipeline settings on codebasebranch.
Integrate the new feature into the Deployments Flow creation process.
Conduct extensive testing to validate the feature's functionality and address any issues.
Update the platform documentation and user guides to include the new codebase selection feature.
Deploy the enhancement to the production environment and monitor user feedback for further improvements.