Shall we switch the templates to use property injection outside the constructor

[JonasHelming]

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as highlighted in the coding guidlines. Affects at least "hello world" and "backend", others to be checked...

https://github.com/eclipse-theia/theia/wiki/Coding-Guidelines#property-injection

[JonasHelming]

What I actually do not like about the field injection is that is does not break the contract :-) Meaning: you add a "silent" dependency