[Typescript] Fix array model of alias to array

[bodograumann]

This applies the bug fix #4981 to the refactored typescript generator.

PR checklist

• Read the contribution guidelines.
• If contributing template-only or documentation-only changes which will change sample output, build the project beforehand.
• Run the shell script ./bin/generate-samples.shto update all Petstore samples related to your fix. This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master. These must match the expectations made by your contribution. You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/config/java*. For Windows users, please run the script in Git BASH.
• File the PR against the correct branch: master
• Copy the technical committee to review the pull request if your PR is targeting a particular programming language.

CC @TiFu (2017/07) @taxpon (2017/07) @sebastianhaas (2017/07) @kenisteward (2017/07) @Vrolijkx (2017/09) @macjohnny (2018/01) @topce (2018/10) @akehir (2019/07) @petejohansonxo (2019/11) @amakhrov (2020/02)

[bodograumann]

I also ran into the any type problem from #6332.
My workaround was to properly define all the types, but this should probably be fixed in the generator as well.
Maybe someone has some time to apply #6335 to the refactored generator.

[macjohnny]

@bodograumann is this ready to be merged?

[bodograumann]

Yes, this is ready imho. @macjohnny