Disallow deletion of bed if occupied

[rithviknishad]

Describe the bug
If a bed is occupied, it should not be allowed to be deleted.

To Reproduce
Steps to reproduce the behavior:

1. Assign a bed to patient
2. Delete the same bed

https://care.coronasafe.in/facility/eaab75f4-4f5c-4685-b769-bbfada64488e/patient/9cd0b475-4211-4773-a740-7ec26d916825/consultation/5160f61a-0b6e-4a83-866e-c538bba983de

https://care.coronasafe.in/facility/eaab75f4-4f5c-4685-b769-bbfada64488e/location/49d5e405-34da-4e4d-9f86-1c08848498ee/beds

Expected behavior
Delete should be disabled if bed is occupied.

Screenshots

[github-actions]

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