CLDR-14717 json: fix repeat keys

[srl295]

Rewrite output section completely to avoid dups

• use JsonObject instead of JsonWriter, using pseudo-jsonpath
• exclude <language type="root"/> explicitly from bcp47-strict output
• remove grammaticalGenderFeatures.json
  it's now folded (back) into grammaticalFeatures.json (where it belongs)

CLDR-14717

• This PR completes the ticket.

[srl295]

            "dateFormats": {
              "full": "EEEE, MMMM d, y G",
              "full-datetimeSkeleton": "GyMMMMEEEEd",
              "long": "MMMM d, y G",
              "long-datetimeSkeleton": "GyMMMMd",
              "medium": "MMM d, y G",
              "medium-datetimeSkeleton": "GyMMMd",
              "short": "M/d/y GGGGG",
              "short-datetimeSkeleton": "GGGGGyMd"
            },

Not a great solution, but avoids having to rewrite the output format.

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[srl295]

this draft PR now depends on #1552

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[srl295]

• the datetime stuff was in CLDR-15113 json: fix repeat keys in dateTime #1552
• this is 'the real fix', although there's more that could be done in rewriting

[srl295]

This commit shows the effect of the change:

• unicode-org/cldr-json@6de9de0

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