Add the ability to modify a selectKit's content with `replaceContent`
Eg.
```
api.modifySelectKit("combo-box").replaceContent(() => {
return {
id: "foo",
name: "Foo",
};
});
```
will override existing content to only include the passed object
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| .. | ||
| addon | ||
| app | ||
| config | ||
| tests | ||
| .npmrc | ||
| ember-cli-build.js | ||
| index.js | ||
| jsconfig.json | ||
| package.json | ||