* INT-4565: Fix IntComponentScan for profiles
JIRA: https://jira.spring.io/browse/INT-4565
* Propagate an `Environment` to the internal `ClassPathScanningCandidateComponentProvider`
in the `IntegrationComponentScanRegistrar` for proper profiles activation
* Ensure the logic works in the `GatewayInterfaceTests`
* Some polishing and performance improvement for the `GatewayInterfaceTests`
* Add a note about `@Profile` in the `gateway.adoc`
* Polishing for the `gateway.adoc`
**Cherry-pick to 5.0.x & 4.3.x**
* * Add not activated by profile gateway interface into the `GatewayInterfaceTests`
* More `GatewayInterfaceTests` polishing
* Fix typo in the `gateway.adoc`
* Fix Checkstyle violation
# Conflicts:
# spring-integration-core/src/test/java/org/springframework/integration/gateway/GatewayInterfaceTests.java
# src/reference/asciidoc/gateway.adoc
# Conflicts:
# spring-integration-core/src/test/java/org/springframework/integration/gateway/GatewayInterfaceTests.java
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