feat(RemovalReasons): Ability to select multiple items in dropdown

[Venefilyn]

At the moment you can select only one option when you have a select element in a removal reason

It would be possible to add multiple attribute to the select and then append all of the entries to the removal message

[creesch]

I guess it is #118 related, unless we can implement this without any issues.

[k3n]

I don't think I've ever seen that selection... how/where is it located?

[Venefilyn]

I don't think I've ever seen that selection... how/where is it located?

PoC, modified locally to showcase how'd it look

[OldGoldie]

Posting a little mockup I made similar to this.