Migrating to Gradle v7

[freddidierRTE]

Mostly :

• Replacing deprecated configurations (compile & testCompile)
• Fix "Implicit duplicate strategy for Copy or archive tasks has been deprecated"
• Fix Asciidoctor plugin deprecation warning

[AlexGuironnetRTE]

Build scan from 6.9 build for reference: https://scans.gradle.com/s/c2q5wbtpwl524

It's also listing deprecations: https://scans.gradle.com/s/c2q5wbtpwl524/deprecations

[AlexGuironnetRTE]

On the difference between implementation & api configurations:

• https://docs.gradle.org/current/userguide/upgrading_version_6.html#sec:configuration_removal
• https://docs.gradle.org/current/userguide/building_java_projects.html#sec:building_java_libraries
• https://docs.gradle.org/current/userguide/java_library_plugin.html#sec:java_library_recognizing_dependencies

[AlexGuironnetRTE]

About "Implicit duplicate strategy for Copy or archive tasks has been deprecated":

The problem is that we have this warning on the processResources task that is created by the Java plugin, so it is difficult to know which files (if any) are causing the issue, and which other plugin is to blame for the duplicate.

It looks like other people have the same issue with different plugins but it's not going to be fixed: gradle/gradle#17236

Logged #1543

[AlexGuironnetRTE]

Build scan in v7: https://scans.gradle.com/s/ct2thtkuxmx3a