MicrometerResilience4JCustomizerConfiguration registers bulkhead metrics twice

[basovnik]

Describe the bug
MicrometerResilience4JCustomizerConfiguration registers bulkhead metrics twice.

https://github.com/spring-cloud/spring-cloud-circuitbreaker/blob/v5.0.1/spring-cloud-circuitbreaker-resilience4j/src/main/java/org/springframework/cloud/circuitbreaker/resilience4j/Resilience4JAutoConfiguration.java#L152-L163

Sample

{"ts":"2026-02-19T22:07:37.934+01","logLevel":"WARN","thread":"main","logger":"io.micrometer.core.instrument.MeterRegistry","message":"This Gauge has been already registered (MeterId{name='resilience4j.bulkhead.available.concurrent.calls', tags=[tag(group=none),tag(name=foo)]}), the registration will be ignored. Note that subsequent logs will be logged at debug level."}