Insert stages at any point in Pipelines

### Description

Currently, our pipeline only supports adding stages to the end. While this might cover many use cases, there are scenarios in which users might need to insert a stage before the current ones (for example, adding a 'staging' stage before 'prod' in an existing application). Furthermore, there may be cases where we might need to add a new stage in the middle of two existing stages.

Having the flexibility to add a stage anywhere in the pipeline not only mirrors real-world software development workflows but also provides users with greater control over their development, testing, and deployment processes.

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate