Hibernate Extension: Remove Configuration Name

[lucamolteni]

Description

See #44473 (comment)

After #44473 we don't need configurationName anymore.

Remove it accordingly

Implementation ideas

No response

[quarkus-bot]

/cc @gsmet (hibernate-orm), @radcortez (config)

[yrodiere]

Fixed in #48007: 8149d79#diff-fc7dcd70d4ff605305fc184ffa4260b715c02b10ad2c3021873e3174f9f6d608L23-L36