fix: Subscriber property

[nick2432]

What change does this PR introduce?

Basically, I updated the POST request code and sent firstName, lastName, and email in the request.

Why was this change needed?

Closes https://github.com/novuhq/novu/issues/4096

Other information (Screenshots)

before

after

[jainpawan21]

@nick2432 I think we should add other properties like phone, locale and data as well

[nick2432]

@nick2432 I think we should add other properties like phone, locale and data as well

If my code implementation is correct, then I will add other properties as well. Could you please check the implementation

[jainpawan21]

Implementation seems to be correct

[nick2432]

Implementation seems to be correct

ok i will add other properties

[github-actions[bot]]

This PR is being closed due to inactivity. Please reopen if work is intended to be continued.