CLDR-18236 Add gmtUnknownFormat

[robertbastian]

CLDR-18236

• This PR completes the ticket.

ALLOW_MANY_COMMITS=true

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Notice: the branch changed across the force-push!

• common/dtd/ldml.dtd is different
• common/dtd/ldml.xsd is different
• common/main/root.xml is different
• common/supplemental/coverageLevels.xml is different
• docs/ldml/tr35-dates.md is different
• tools/cldr-code/src/test/java/org/unicode/cldr/unittest/TestExampleGenerator.java is different
• tools/cldr-code/src/test/resources/org/unicode/cldr/unittest/data/common/dtd/ldml.dtd is different

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