support explicitly disabling dev services for cognito user pools

[emattheis]

Copied implementation from base class used by other services:

quarkus-amazon-services/common/deployment-devservices-spi/src/main/java/io/quarkus/amazon/common/deployment/spi/AbstractDevServicesLocalStackProcessor.java

Lines 27 to 33 in 4ac8b51

	// explicitely disabled
	if (!devServicesBuildTimeConfig.enabled().orElse(true)) {
	log.debugf(
	"Not starting Dev Services for Amazon Services - %s, as it has been disabled in the config.",
	enabledService.getName());
	return null;
	}

Addresses concern raised here: quarkusio/quarkus#34801 (comment)

[scrocquesel]

@all-contributors please add @emattheis for code

[allcontributors]

@scrocquesel

@emattheis already contributed before to code