Tools and prompts list are difficult to review

### Checks

- [x] I have searched [github.com/aws/amazon-q-developer-cli/issues](https://github.com/aws/amazon-q-developer-cli/issues?q=) and there are no duplicates of my issue
- [x] I have run `q doctor` in the affected terminal session
- [x] I have run `q restart` and replicated the issue again

### Operating system

macOS 15.4.1 (24E263)

### Expected behaviour

### 1. Sorting
Right now, the output of `/prompts` and `/tools` doesn't seem to be sorted in any particular order. This makes it hard to review this list and locate a specific prompt or tool.

### 2. Tool name mangling
Tool names are always shown mangled with the mcp server name prefixed, i.e. instead of:
```
sqlite (MCP):
- append_insight * not trusted
- create_table * not trusted
- describe_table * not trusted
- list_tables * not trusted
- read_query * not trusted
- write_query * not trusted
```
we show the below, which is much harder to read:
```
sqlite (MCP):
- sqlite___append_insight * not trusted
- sqlite___create_table * not trusted
- sqlite___describe_table * not trusted
- sqlite___list_tables * not trusted
- sqlite___read_query * not trusted
- sqlite___write_query * not trusted
```

### Actual behaviour

### 1. Sorting
Sort the output of `/prompts` and `/tools` as described below (and as noted [in the PRD](https://quip-amazon.com/FqMKA1y81REl/MCP-support-in-Q-Developer#temp:C:Maa60df3b78246f409385476a135)):

In the output of `/prompts`:
1. The MCP groups should be displayed in alphabetical order
2. Within each group, the prompts for that group should be displayed in alphabetical order

In the output of `/tools`:
1. The "Built-in" group should be shown first
2. Then, the MCP groups should be displayed in alphabetical order
3. Within each group, the tools for that group should be displayed in alphabetical order

### 2. Tool name mangling
Don't mangle tool names in the output. Tool names are already shown grouped into MCP servers, so there is no need to prefix the MCP server name to the toolname.

(On a related note, this is not just a display issue. We should not be unnecessarily mangling tool names when there is no name conflict. [See the PRD](https://quip-amazon.com/FqMKA1y81REl/MCP-support-in-Q-Developer#temp:C:Maa389ccd4778c44890952b9c8ab).)

### Steps to reproduce

Run the `/tools` or `/prompts` command.

### Environment

```yaml

[q-details]
version = "1.9.1"
hash = "5d2c2807cab9bc6c9dc5fcd05f92c7a979e8a4f7"
date = "2025-04-29T06:22:42.917989Z (10d ago)"
variant = "full"

[system-info]
os = "macOS 15.4.1 (24E263)"
chip = "Apple M3"
total-cores = 8
memory = "24.00 GB"

[environment]
cwd = "/Users/USER"
cli-path = "/Users/USER"
os = "Mac"
shell-path = "/bin/zsh"
shell-version = "5.9"
terminal = "macOS"
install-method = "brew"

[env-vars]
PATH = "/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin"
QTERM_SESSION_ID = "861875d35e244fd9b7bd54ce51e9e6a9"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.9.1"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
__CFBundleIdentifier = "com.apple.Terminal"
```

Beginne damit, die Befehle `/tools` und `/prompts` mit MCP-Gruppen auszuführen, um die aktuelle Reihenfolge und die angezeigten Namen zu beobachten. Verfolge die Einstiegspunkte der Befehle und die bestehende MCP-Gruppierungslogik; erledigt bedeutet: Built-in erscheint bei den Tools zuerst, MCP-Gruppen und ihre Einträge sind alphabetisch sortiert, Prompts sind alphabetisch gruppiert, und Tool-Namen werden nicht mehr unnötigerweise mit Präfixen versehen.

Vom Indexierungsmodell aus dem Issue-Text verfasst.