Get multiple properties from EnvironmentSpecificConfiguration fails

[AndreasScharfCPB]

Hi,

I believe this line is not correct. The negation is wrong. At least if I am understanding the method correctly.
Also tested it an if I remove the negation I can successfully call
EnvironmentSpecificConfiguration.from(environmentVariables).getPropertiesWithPrefix("propPart1.propPart2");
...and it gets me all the sub-properties for that envronment for the specific root key "propPart11.propPart2"
https://github.com/serenity-bdd/serenity-core/blame/08725f0135fd80ddbb1cb7abf904bbcbb864b8a3/serenity-model/src/main/java/net/serenitybdd/model/environment/EnvironmentSpecificConfiguration.java#L67

Thank you for your support.

[wakaleo]

Changing this line breaks the tests in https://github.com/serenity-bdd/serenity-core/blob/main/serenity-model/src/test/groovy/net/serenitybdd/model/environment/WhenDefiningBaseUrlsForDifferentEnvironments.groovy. Have a look at those tests and see if you can come up with a PR that supports the behaviour you are after.