CLDR-15764 Add examples with RTL context to reports; fix other report issues

[pedberg-icu]

CLDR-15764

• This PR completes the ticket.

Add examples with RTL context (I addition to neutral context) to the date time & numbers reports where relevant. Also fix some other report issues:

• dateTime intervals involving a difference of just minutes had a bad end date.
• dateTime formats combining a relative day and a time should use the "atTime" variant of the combining pattern (the fix here did not actually work, filed https://unicode-org.atlassian.net/browse/CLDR-17653 for a follow-on fix).
• the numbers reports did not show formats for negative numbers or zero, added those.

ALLOW_MANY_COMMITS=true

[pedberg-icu]

@srl295 Thanks for review. All looks good in smoketest except still not using the "atTime" variant of the dateTime combining format for the relative items. I will handle that with another PR, and probably another ticket since that was not actually one of the things requested in ticket for this.

[pedberg-icu]

Filed https://unicode-org.atlassian.net/browse/CLDR-17653 for the atTime issue.