[QUARKUS-LANGCHAIN4J-XXXXX] Remove manual reflection-configs override from data-extract examples

[aldettinger]

Bug description

Remove manual reflection-configs override from data-extract examples when issue quarkiverse/quarkus-langchain4j#1644 is fixed.

[aldettinger]

A fix is on the way:
quarkiverse/quarkus-langchain4j@8ed75b4

The next step is to check in what version it will be shipped.

[jamesnetherton]

I guess the wider issue (maybe for #7440) is, do we have the same problem for other model providers? I've not tested OpenAI etc to verify it.