Need to add zh-cmn* to common/supplemental/supplementalMetadata.xml

Description

spin off from https://unicode-org.atlassian.net/browse/ICU-21115

The following zh-cmn* should be added into https://github.com/unicode-org/cldr/blob/master/common/supplemental/supplementalMetadata.xml

(these are already in ICU coded as REDUNDANT in https://github.com/unicode-org/icu/blob/master/icu4c/source/common/uloc_tag.cpp#L153

Peter said he has a different proposal for how to deal with zh-cmn so this ticket may (or may not) conflict with that.

From https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry

%%
Type: redundant
Tag: zh-cmn
Description: Mandarin Chinese
Added: 2005-07-15
Deprecated: 2009-07-29
Preferred-Value: cmn
%%
Type: redundant
Tag: zh-cmn-Hans
Description: Mandarin Chinese (Simplified)
Added: 2005-07-15
Deprecated: 2009-07-29
Preferred-Value: cmn-Hans
%%
Type: redundant
Tag: zh-cmn-Hant
Description: Mandarin Chinese (Traditional)
Added: 2005-07-15
Deprecated: 2009-07-29
Preferred-Value: cmn-Hant
%%

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Reporter

Frank Yung-Fong Tang

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