fix(dashboard): add client side validation for apns key

[jainpawan21]

What changed? Why was the change needed?

• add client side validation for apns key
• add type text area for apns key credentials

User key is in single line format and novu is throwing this error:

{
  "jse_shortmsg": "Failed to generate token",
  "jse_cause": {},
  "jse_info": {},
  "message": "Failed to generate token: secretOrPrivateKey must be an asymmetric key when using ES256"
}

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Related enterprise PR

Special notes for your reviewer

[linear]

NV-5627 apns push notifications fails with assymetric key error

[SokratisVidros]

As discussed offline, we will add a validation error during the creation of APN integration so that users are informed proactively about invalid integration properties.

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