Fix LikelySubtags data for ICU73 and before

[sven-oly]

LikelySubtags.txt has changed location and format in ICU74 compared to previous versions.

TODO: update date generation to consider the ICU version.

Before ICU74, the data has only the minimized and maximized values in this form:
aa{"aa_Latn_ET"}
aai{"aai_Latn_ZZ"}
aak{"aak_Latn_ZZ"}
...

ICU73 likelySubtags.txt

Note: the data is in the same place for ICU68 - ICU73 (at least)

In ICU4J 74, the test data has moved and is in two places, with identical contents.
ICU73 likelySubtags.txt

Same info is here:
icu4c/source/test/testdata/cldr/localeIdentifiers/likelySubtags.txt

// Source ; AddLikely ; RemoveFavorScript ; RemoveFavorRegion
// Source: a locale to which the following operations are applied.
// AddLikely: the result of the Add Likely Subtags.
// If Add Likely Subtags fails, then “FAIL”.
// RemoveFavorScript: Remove Likely Subtags, when the script is favored.
// Only included when different than AddLikely.
// RemoveFavorRegion: Remove Likely Subtags, when the region is favored.
// Only included when different than RemoveFavorScript.
//
// Generation: GenerateLikelyTestData.java

af ; af-Latn-ZA ; af ;
af-AQ ; af-Latn-AQ ; af-AQ ;
af-Egyp ; af-Egyp-ZA ; af-Egyp ;
af-Latn ; af-Latn-ZA ; af ;
af-NA ; af-Latn-NA ; af-NA ;