Remove usage of classifier of all Camel/Fuse SpringBoot based quickstarts/templates/boosters

based on RHOAR team, the use of the classifier should be nowadays avoided. They were initially using as workaround. It seems that they are now using another workaround which is "cleaner". It allows to stay closer to an out of the box SpringBoot project and then to have it working with [odo](https://github.com/redhat-developer/odo)

The other workaround is to specific a name on the maven-failsafe-plugin classes-directory, see https://github.com/snowdrop/spring-boot-http-booster/blob/a5b271f3bf1356d5e46b75ef7d463ea7d462c1a9/pom.xml#L194 and notice that there is no classifier https://github.com/snowdrop/spring-boot-http-booster/blob/a5b271f3bf1356d5e46b75ef7d463ea7d462c1a9/pom.xml#L168-L178
See the commit which did that https://github.com/snowdrop/spring-boot-http-booster/commit/1eac1c2780968a48a0aeceb9c7bb5b712cde72a2