Extend search in automatic suggestion tab from translation memory only to weblate internal machinery, as well

## Situation

During translation, the "Automatic suggestions" tab provides powerful tooling and according machinery results, which are giving a major contribution to translators efficiency. It provides a search field in order to play with deviations / alternatives to the given source string.

## Goal

As a translator, I want to use the search field in the "Automatic suggestions" tab in order to benefit from the "Copy" or "Copy and save" actions based on the provided results. Therefore, I expect to receive search results from any configured machinery, not limited to translation memory.

## Problem

The search field only provides results given by `Weblate Translation Memory` machinery. This might be a relict from the times where we had a `Machine translation` tab and a `Translation memory` tab which were merged to `Automatic suggestion` tab.

## Solution Approach

Extend this search to include any configured machinery. May to limit inclusion to `weblate` machinery (to avoid unforseeable external costs of other machines as DeepL et.al.)

Optional:
- offer options to search in TM only or to include other machineries
- could be realized with checkbox, or, two buttons `search all` and `search TM`
- Question is, how fine granular the selection of option shall be offered. I.e. shall it be possible to select/deselect any machinery specifically? > this can result in many checkboxes.

### Describe alternatives you've considered

_No response_

### Screenshots

_No response_

### Additional context

_No response_