CLDR-15882 add a test to verify coverage for locale names

[srl295]

CLDR-15882

• [ ] This PR completes the ticket.

ALLOW_MANY_COMMITS=true

[srl295]

Note, a bunch of failures:

CLDR {
  LikelySubtagsTest {
    TestMissingInfoForLanguage {
      Error: (LikelySubtagsTest.java:371) Language ak: fix coverageLevels.txt: Expected MODERN but got comprehensive for //ldml/localeDisplayNames/languages/language[@type="ak"] - tcLocale:true, locale calculated coverage:moderate
      Error: (LikelySubtagsTest.java:371) Language ee: fix coverageLevels.txt: Expected MODERN but got comprehensive for //ldml/localeDisplayNames/languages/language[@type="ee"] - tcLocale:true, locale calculated coverage:basic
      Error: (LikelySubtagsTest.java:371) Language gaa: fix coverageLevels.txt: Expected MODERN but got comprehensive for //ldml/localeDisplayNames/languages/language[@type="gaa"] - tcLocale:true, locale calculated coverage:basic
      Error: (LikelySubtagsTest.java:371) Language ii: fix coverageLevels.txt: Expected MODERN but got comprehensive for //ldml/localeDisplayNames/languages/language[@type="ii"] - tcLocale:false, locale calculated coverage:basic
      Error: (LikelySubtagsTest.java:371) Language nb: fix coverageLevels.txt: Expected MODERN but got comprehensive for //ldml/localeDisplayNames/languages/language[@type="nb"] - tcLocale:true, locale calculated coverage:modern
      Error: (LikelySubtagsTest.java:371) Language nso: fix coverageLevels.txt: Expected MODERN but got comprehensive for //ldml/localeDisplayNames/languages/language[@type="nso"] - tcLocale:true, locale calculated coverage:basic
      Error: (LikelySubtagsTest.java:371) Language om: fix coverageLevels.txt: Expected MODERN but got comprehensive for //ldml/localeDisplayNames/languages/language[@type="om"] - tcLocale:true, locale calculated coverage:basic
      Error: (LikelySubtagsTest.java:371) Language rw: fix coverageLevels.txt: Expected MODERN but got comprehensive for //ldml/localeDisplayNames/languages/language[@type="rw"] - tcLocale:true, locale calculated coverage:basic
      Error: (LikelySubtagsTest.java:371) Language st: fix coverageLevels.txt: Expected MODERN but got comprehensive for //ldml/localeDisplayNames/languages/language[@type="st"] - tcLocale:true, locale calculated coverage:basic
      Error: (LikelySubtagsTest.java:371) Language tn: fix coverageLevels.txt: Expected MODERN but got comprehensive for //ldml/localeDisplayNames/languages/language[@type="tn"] - tcLocale:true, locale calculated coverage:basic