AIP-83 question 4.b. manual run data interval behavior

[dstandish]

Manual runs, schedule-driven dag

If logical date null, there should be no data interval; if logical date not null, data interval should be as normal.

If logical date is null, accessing data interval in context or templates should result in a key error.

Manual runs, dag is asset driven

There will be no data interval.

Accessing data interval in context or templates should result in a key error.

[sunank200]

I am pushing changes to null-logical-date-for-ui-trigger branch.

[sunank200]

PR: 46512