Add ICU4J, NodeJS executors for CLDR 46 / ICU 76

[sven-oly]

[sven-oly]

This should be done for ICU4J, ICU4X, and NodeJS when these are available

[sven-oly]

PR #348 adds NodeJS for ICU76.1 with version 23.3.0.

Note that ICU4X is the only outstanding required platform for ICU76.

[sven-oly]

We need ICU4X 2.0 support. I cannot do this myself, but need help!

[echeran]

ICU4X portion of the work has been extracted out into a separate issue #355 since it entails some extra work.