CLDR-17634 Verify that all prior-Basic locale names have English and Coverage

[srl295]

Also misc improvements:

• ToolConstants.previousVersion()
• CalculatedCoverageLevels.forVersion() for loading prior versions
• Level.isAbove()

CLDR-17634

• This PR completes the ticket.

ALLOW_MANY_COMMITS=true

[srl295]

• Since Coverage is locale based, I’m testing in all SupplementalDataInfo.getLanguageTcOrBasic() locales, that is if they are TC or Basic.
• I’m testing to fail if any of those locales have any of the language XPaths at level higher than MODERN (so fail if COMPREHENSIVE)… what should the goal be here? should it fail if above MODERATE?

Example error message (fake data, with real data it passes)

org.opentest4j.AssertionFailedError: en.xml is missing translations for these languages' names:[cs, csw, cv, cy, da, de]

org.opentest4j.AssertionFailedError: coverageLevels.xml has a coverage level >modern for these language's names:[bho, brx, bs, ca, ceb, cs, cv, cy, da, doi, el, et, eu, fa]

[AEApple]

Does this mean we can deprecate the BRS item?

[srl295]

Does this mean we can deprecate the BRS item?

Retire that BRS debt!

Yes it should mean the test will fail during SBRS as soon as the version number is flipped. Could maybe make an option to make it fail early if you set an option?