SCJ-244: Limit trial length to 40 days

[duncan-oxd]

QA reported some problems when you put in a huge number like 999999 for the trial length.
After some discussion we decided to just limit it to a realistic number. I see there's already validation code in the data writer service:

            if (
                !bookingInfo.EstimatedTrialLength.HasValue
                || bookingInfo.EstimatedTrialLength.Value < 1
                || bookingInfo.EstimatedTrialLength.Value > 99
            )
            {
                throw new InvalidOperationException(
                    "HearingLength must be greater than zero and less than 100"
                );
            }

So I've limited the input to a maximum value of 99 to match that.

[duncan-oxd]

Updated the code to limit the trial length input to 40 days where it was previously 99