Skip module-info.class files during REPL tab-completion

[lihaoyi]

fixes #20421. module-info-class files are weird class files that cause problems during parsing, and anyway they can't contain things that autocompletion should care about anyway, so better just to skip them

Tested manually via

sbt --client scala3-compiler-bootstrapped-new/publishLocalBin &&
sbt --client scala-library-bootstrapped/publishLocalBin &&
sbt --client scala3-library-bootstrapped-new/publishLocalBin &&
sbt --client tasty-core-bootstrapped-new/publishLocalBin &&
sbt --client scala3-repl/publishLocalBin &&
java -cp $(cs fetch -p org.scala-lang:scala3-repl_3:3.8.1-RC1-bin-SNAPSHOT) dotty.tools.repl.Main -cp $(cs fetch -p org.scala-lang:scala3-repl_3:3.8.1-RC1-bin-SNAPSHOT)

Passing a problematic classpath to the REPL. Without this PR, the upstream issue appears. With this PR, it doesn't