Adding session arguments to a tracked mutation function turns it into a query function

### Version Information

Server Version: 2.0.10
CLI Version (for CLI related issue): 2.0.0-beta.1

### Environment

Localhost (MacOS)

### What is the expected behaviour?

After adding the session arguments to a tracked volatile function (tracked as mutation), it should simply work!

### Keywords

functions, mutation, session argument

### What is the current behaviour?

After adding the session arguments to a tracked volatile function (tracked as mutation), the metadata removes the `exposed_as: mutation` which turns it into a normal (tracked as a query) function. This can be fixed by manually changing the yaml file in the metadata so the bug is related to the UI console.

### How to reproduce the issue?

1. Create a volatile function that gets a session argument and track it as a mutation
2. Set the session argument name
3. Watch as it changes to a query instead!

### Any possible solutions?

Probably a simple bug in the console.

### If the bug is confirmed, would you be willing to submit a PR?

Nope!

Start in the UI console flow for tracking a volatile function as a mutation and setting its session argument name. Reproduce the metadata change and inspect why exposed_as: mutation is removed. Done means the session argument can be configured without changing the tracked function into a query.

Written by the indexing model from the issue text.