Plugin adds maven repo to the project

[BoD]

Here (added in #2809) the maven repo https://packages.jetbrains.team/maven/p/ij/intellij-dependencies is automatically added to the project.

This isn't great:

• for security - projects should manage their list of repositories. Adding one automatically behind the scenes when applying the plugin isn't very visible.
• this can actually break builds (our case) as the project repos override the settings one

Note: using repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS) (which is set by the default Android new project template) should also fail due to this added repo.

[tbroyer]

It also looks like this repository contains artifacts that also exist in Central (or elsewhere), and it's not declared with content filtering.

[BoD]

@jaschdoc Correct me if I'm wrong but that PR still adds a maven repo here?

Woops, ignore me, I misread.