Because there is no guarantee about a daily job running exactly once a
day, we need to store the last time that the email was sent, so that we
can refrain from sending one if it's been less than a day since the
last.
A setting has been used for this as we don't currently have a pattern
for it, we might want to consider moving this to some kind of cache
based solution in future. This has been added as a core setting so that
we don't expose it via the API.
The setting is stored as a number to allow us to store value as unix timestamp.
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Co-authored-by: Rishabh <zrishabhgarg@gmail.com>
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