…2180)  (#2182)

By default I expect that tests run with the same Scala.js settings as the parent.

Backport of:  #2180

Pull request: #2182

…ackport of #2183) (#2187)

Backport of:  #2183

Pull request: #2187

… of #2242) (#2254)

This is useful when you enable deprecation warnings using:
```scala
interp.configureCompiler { c =>
  val settings = c.settings
  settings.nowarnings.value = false
  settings.maxwarns.value = 100
  settings.deprecation.value = true
}
```
Otherwise, it prints warnings for unused deprecated targets in
`mill.main.MainModule`.
In `0.10.10` it prints:
```
/Users/lorenzo/scala/example-mill-4/build.sc:61: method all in trait MainModule is deprecated (since mill after 0.10.0-M3): Use the + separator, wildcards, or brace-expansion to specify multiple targets.
  implicit lazy val millDiscover: _root_.mill.define.Discover[this.type] = _root_.mill.define.Discover[this.type]
                                                                                                      ^
/Users/lorenzo/scala/example-mill-4/build.sc:61: method par in trait MainModule is deprecated (since mill after 0.10.0-M3): Use the + separator, wildcards, or brace-expansion to specify multiple targets.
  implicit lazy val millDiscover: _root_.mill.define.Discover[this.type] = _root_.mill.define.Discover[this.type]
```

Co-authored-by: Tobias Roeser <le.petit.fou@web.de>

Initial pull request: #2242

Pull request: #2254

Also added tests for `MillMain.clean`

Original pull request: #2257

Pull request: #2258

Pull request: #2263

Pull request: #2265

…2279) (#2280)

Original pull request: #2279

Pull request: #2280

#2273) (#2281)

Original Pull Request: #2273

Co-authored-by: dmitrii.naumenko <dmitrii.naumenko@jetbrains.com>

Pull request: #2281