CLDR-18129 Investigate and fix (where necessary) invalid codes

[macchiati]

CLDR-18129

common/dtd/ldml.dtd

• for @match language@type, use nlocale (locales for names)

common/dtd/ldmlSupplemental.dtd

• all @match changes:
• languageAlias@type, use bc47-wellformed (locales for names), and list allowed ill-formed values
• likelySubtag@from&to, use xlocale (which allows for compatibility cases like "iw"
• pluralRules@locales, use xlocale but also allow "sh"

common/main/en.xml
common/main/fi.xml
common/main/la.xml
common/main/nl.xml
common/supplemental/supplementalData.xml
common/supplemental/supplementalMetadata.xml

• Tighten down the test to avoid deprecated / predominant-encompassed languages.
• Add XLocaleMatchValue, NLocaleMatchValue to allow for special cases

tools/cldr-code/src/main/java/org/unicode/cldr/util/MatchValue.java

• tighten up validity/locale to disallow deprecated
• allow for setting the status for each field separately
• provide for subclassing to extend the language check

tools/cldr-code/src/main/java/org/unicode/cldr/util/SupplementalDataInfo.java
tools/cldr-code/src/main/java/org/unicode/cldr/util/Validity.java

• Allow for testing validity against past versions

tools/cldr-code/src/main/java/org/unicode/cldr/util/UnitConverter.java

• clean up some code that didn't allow for old versions

tools/cldr-code/src/test/java/org/unicode/cldr/unittest/TestAttributeValues.java

• Enhance testing to print (warnln) details of which items caused failures.

tools/cldr-code/src/test/java/org/unicode/cldr/unittest/TestBasic.java

• Add compatibility test for bcp47 to ensure that identifiers never disappear

• This PR completes the ticket.

ALLOW_MANY_COMMITS=true