test: enable existing aot i18n E2E test for ivy

[clydin]

This is blocked on a FW xliff 1.2 parser fix for optional target-language attribute support.

[filipesilva]

target-language was not needed in VE but seems to be required on Ivy.

@clydin looked into this and it seems like the xliff 1.2 parser lists it as optional in http://docs.oasis-open.org/xliff/v1.2/os/xliff-core.html.

But @angular/localize will throw if it's not there: https://github.com/angular/angular/blob/ec482dadb19eea5cd247eb7428a5d88640bd38f8/packages/localize/src/tools/src/translate/translation_files/translation_parsers/xliff1/xliff1_translation_parser.ts#L56

@petebacondarwin can you shed some light on this? Is this intended, and if so, is there documentation telling users they must do it?

[filipesilva]

Sounds like it's a bug, opened as angular/angular#33323

[petebacondarwin]

PR to unblock this: angular/angular#33381

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