CLDR-18108 Give all languages a primary script: trivial cases (#4210)

This change adds "primary" scripts to many languages in language_script.tsv.

This won't change likely subtags, rather this just future-proofs our data by recognizing a singular primary script, avoiding issues where ambiguities served customers the wrong script.

I also added scripts for languages in country_language_population.tsv that were missing.

There are many more tasks, especially more complicated ones, in the parent ticket https://unicode-org.atlassian.net/browse/CLDR-18102