improvement: List<MessageSource> already ordered

[sdelamo]

This PR adds a test to verify message source order is taken into account. Moreover, it simplifies the CompositeMessageSource constructor just passing a List of beans of type MessageSource. The list will be already ordered.

[dstepanov]

A collection is not ordered by a list is?

[sdelamo]

A collection is not ordered by a list is?

I am unsure if a Collection of beans of a certain type gets injected or ordered. The fact that the previous code ordered the collection explicitly tells me the collection may not have been injected in order.

Nonetheless, I think injecting a List of beans of a certain type is more correct, which clearly conveys that you want an ordered collection.

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
37.5% Coverage on New Code
0.0% Duplication on New Code

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