fix:Tasks with duration less than a day not displayed correctly#15554

[Poorvi-R-Bhat]

There were 2 parts related to the same issue:

1. The tasks cannot be opened directly from the gantt chart when the Expected End Date is not set. Before:

After: Able to open the task from the gantt view

2. Task in the Gantt view was displaying 3 days though the Expected Time set is 2 hours. Before:

After: Expected Start Date and Expected End Date are now Datetime fields and showing the task expected time properly in the gantt view on selecting the Quarter day and all the other tabs.