core/local/analysis: Add changeFound(true) support
core/local/analysis: Add changeFound(true) support

To allow for future change analysis functions to just return `true`
in case an existing change was transformed, not a new one created, e.g.:

```js
changeFound(
  detectCase1() ||
  detectCase2AndTransformPreviousChange() ||
  // If the previous one returned true, the next detection won't occur:
  detectCase3()
)
```

Although `true` may not be the best representation, the goal is to fix
the most problematic issue first: deeply nested conditionals.
Naming will then be easy to improve in a subsequent PR.

cozy-labs/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop