Gradle - Allow not using the -b parameter

[yahavi]

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• This pull request is created in the jfrog/jenkins-artifactory-plugin repository.

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Resolves #583

Backgroud
-b flag is depracated and will be removed in Gradle 8.

The problem
There are 2 path parameters provided to the user: rootDir and buildFile.
Currently, the Jenkins Artifactory plugin concatenates them to 1 path variable and passes it to Gradle as the following:
gradle clean aP -b <rootDir>/<buildFile>.
No matter what, it always provides the -b parameter to Gradle.

The solution
Use the -b parameter for buildFile and -p parameter for rootDir:
gradle clean ap -b <buildFile> -p <rootDir>.
This way, when the buildFile parameter doesn't being provided, the -b flag is not in use.
Users who want to migrate to Gradle 8, just need to make sure to not provide the buildFile parameter, because it same as running gradle with -b.