deleteContactsFromGroup

Removes multiple contacts from a specific group.

This method removes a list of contacts, identified by contactIds, from the group specified by groupId. The result is returned as a RainbowResult, indicating success or failure. Upon success, the group's details are updated in the groups property.

Validation Rules:

• groupId must not be null or empty.

• contactIds must not be empty; null or empty IDs in the list will be ignored.

Behavior:

• If groupId is null or empty, the function returns a Failure with an appropriate error message.

• If contactIds is empty, a Failure is returned.

• If all contacts are successfully removed, a success is returned.

• If some removals fail, a Failure with error details is returned.

Parameters