The problem with `GetInterval()` was that the returned type was of
`metav1.Duration`, while almost anywhere it was used, a type of
`time.Duration` was requested. The result of this was that we had to
call `GetInterval().Duration` all the time, which would become a bit
cumbersome after awhile.
To prevent this, we introduce a new `GetRequeueAfter() time.Duration`
method, which both results the right type, and bears a name that is
easier to remember where the value is used most; while setting the
`Result.RequeueAfter` during reconcile operations.
The introduced of this method deprecates `GetInterval()`, which should
be removed in a future MINOR release.
Signed-off-by: Hidde Beydals <hello@hidde.co>
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