fix(allure-scalatest): cross-build for scala 2.12 and 2.13

[baev]

Context

Checklist

• Sign Allure CLA
• Provide unit tests

[atais]

Great job! Thanks for fixing the missing parts!

🎆 🍾

please, dont forget to release the fixed scalatest version asap 😉

I will cancel my PR and this ultimately fixes #1104

[prokod]

I have created a test similar to this PR to try and achieve the same, having <name>_2.13-<version>-<classifier> and I was not able. So currently scala cross compiling documentation stating limitation for creating scaladoc, sources for the crossed compiled artifacts still stands

[baev]

@prokod, please see the final version in the main repo. You need to apply two more fixes:

1. fix(scalatest): resolve issues with crossbuild signing #1111
2. b40acff

After that, the release was accepted by Sonatype and successfully added to Maven Central, see https://mvnrepository.com/artifact/io.qameta.allure/allure-scalatest

[prokod]

@baev with the additional code changes it makes now sense. Thx for pointing me to that.