assistant2: Add ability to configure tools for profiles in the UI (#27562)

This PR adds the ability to configure tools for a profile in the UI:


https://github.com/user-attachments/assets/16642f14-8faa-4a91-bb9e-1d480692f1f2

Note: Doesn't yet work for customizing tools for the default profiles.

Release Notes:

- N/A

crates/assistant2/Cargo.toml

@@ -62,7 +62,6 @@ prompt_library.workspace = true
 prompt_store.workspace = true
 proto.workspace = true
 release_channel.workspace = true
-regex.workspace = true
 rope.workspace = true
 serde.workspace = true
 serde_json.workspace = true