BF-33222 set binSize to null instead of "" (empty string)

[lgfang]

Jira Ticket: BF-33222

Whats Changed:

Set a "binSize" value to null. Originally it lacked a value. During YAML linting and formatting, we set its value to an empty string. Now, change it to null as the corresponding test failed with the value being an empty string.

Patch testing results:

patch

Related PRs:

If applicable, link related PRs

[jimoleary]

LGTM

Ugh looks like fixing the following went from an implicit null to an explicit "":

      pipeline: [{$sort: {"time": 1}},
                 {$addFields: {
                    "t": {$dateTrunc: {
                    date: "$time",
                    unit: "second",
                    binSize
                  }}

We might want to look through the changes to see if there are any more but I'm not sure how we would do that automatically :-(

[thessem]

@jimoleary if it makes you feel less anxious I did pick up the inconsistency in #1205 (review), it just seems like the fix was the wrong way of going about it. It was only the binSize and some of the octal->non-octal changes that worry me, so this PR removes half my worries.