Subject upload - ID issue

[mahalakshme]

https://avni.freshdesk.com/a/tickets/4765

ID should not be required.

AC:

• Have two modes, Create and Edit for all forms
• In create mode - remove Id field from sample file
  - Though it is removed, when mentioned it should consider it as legacy id
• In Edit mode have the header as ID like we have currently: It can accept legacy id or uuid like done currently

Need:

Since Id field is mentioned, users mention some random number during each upload. Since it means legacy id, when by mistake user uses the same Id across upload, that results in loss of old data since it overwrites it.

Out of scope:

Further CSV improvements