Docker image with embeded Tomcat

[paulo-graca]

Is your feature request related to a problem? Please describe.
The merge of #8797 introduces the embeded tomcat feature. Saying it so, I would be useful if docker images could be simplified also by using it.

Describe the solution you'd like
We need to refactor Dockerfile and change the existing commands to be compatible with this way of deployment. Meaning you don't need to do all of this https://github.com/DSpace/DSpace/blob/main/Dockerfile#L52-L66. Considering the instructions here: #8797 (comment) it would be something like:

mvn spring-boot:run -Dspring-boot.run.arguments="--dspace.dir=/path/to/install/folder/ --logging.config=file:///path/to/install/folder/config/log4j2-console.xml"