Beds can have conflicting records across patients

[Ashesh3]

Describe the bug
When a bed is assigned to a patient for a duration of time, it is considered in-use by that patient for that amount of time. The issue is that the same bed can be assigned to another patient in between the time it was assigned to the previous patient. Suppose you assign BED1 to Patient1 from 1pm to 3pm. You are also able to assign the same BED1 to another patient, say, Paitent2 for a conflicting time range, say 2pm to 2:30pm.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://care.coronasafe.in/patients?facility=10c66ed2-5b95-4649-bd2f-f5766334e1cd&page=1&limit=12&emergency_phone_number=
2. Click on the first patient
3. Assign a bed to that patient
4. Wait 10 minutes
5. Unassign the bed from the patient (by assigning a new bed to that patient)
6. Click on the second patient
7. Assign the bed which was assigned previously to the first patient with a start time which falls in between the time range between when the bed was in use already.
8. It allows us to create the conflicting record

Screenshots
Patient 1:

Patient 2:

Expected behavior
It should show an error and disallow such conflicting entries to be created.

[github-actions]

⚠️ Refrain from assigning this issue to yourself if you have another P1 issue assigned that is not yet closed.
@sainak kindly acknowledge this message by commenting 'Acknowledged' below.

[github-actions]

Hi, @gigincg, @nihal467, @khavinshankar, @mathew-alex, @aparnacoronasafe, This issue has been automatically marked as stale because it has not had any recent activity.