Disable the environment info contributor by default

[philwebb]

For consistency with #28310 we should not expose the environment info contributor by default.

[charboubmustapha]

Hello @wilkinsona @philwebb ,
Happy new year 🥳 best wishes.
I'm facing an issue using the version 2.6.2 even if the info is enable , the call to /info don't display custom info properties .
I think it's related to the configuration of EnvironmentInfoContributor in InfoContributorAutoConfiguration . the fallback is all time disabled

[wilkinsona]

The fallback should only be used when the property has not been set and we have a test that verifies that the contributor can be enabled:

spring-boot/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/info/InfoContributorAutoConfigurationTests.java

Lines 51 to 55 in 4256344

	@Test
	void envContributor() {
	this.contextRunner.withPropertyValues("management.info.env.enabled=true")
	.run((context) -> assertThat(context).hasSingleBean(EnvironmentInfoContributor.class));
	}

if setting management.info.env.enabled=true does not work for you, please open a new issue with a minimal sample that reproduces the problem and we can take a look.