Fixes #16491: Port Rudder to Scala 2.13

[fanf]

https://issues.rudder.io/issues/16491

There is a lot of little things, only one tricky, so start by that one:
In scala.xml, Node ++ Node leads to Seq[Node] in place of NodeSeq. There is nothing special for method awaiting NodeSeq because there's an implicit conversion, but when a method accepts Seq[A], it keeps the former. This is a problem for lift #> which accept both Seq[A] et NodeSeq with different semantic. On Seq[A], it applies the mapping on all A, else it applies one whole NodeSeq. So we need to force everything to NodeSeq to be sure.

Other things:

• some lib needed to be updated to have a scala 2.13, but all to version with similar semantic (doobie just need an explicit import for Timestamp now)
• changes in scalac flags lead to various change in imports
• the biggest change: there is no more automatic conversion between mutable and immutable collection, so that leads to a lot of .toSeq
• mapValues and filterKey are now method on view, which has a different type to make explicit when there is a view. So we must force its evaluation with toMap afterward.
• compiler is more strict on several things, so we needed to add type annotation, missing escape, 1L in place of 1l, etc
• we need to call toString before + (thing not coerced to string automatically by default, which is a big win against silly errors)

[fanf]

PR updated with a new commit

[fanf]

PR updated with a new commit

[fanf]

PR updated with a new commit

[Normation-Quality-Assistant]

OK, squash merging this PR