[src] Avoid creating accounts with duplicate names

[YarinPinyan]

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Demo

With the following code, that the first account that exists under your entered Spotinst creds file, it should raise a SpotinstClientException

spotinst = SpotinstSession()

client = spotinst.client(service="admin")
my_accounts = client.get_accounts()
if my_accounts:
    sample_name: str = my_accounts[0]['name']
    client.create_account(sample_name)

Output

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have validated all the requirements in the Jira task were answered
• I have all necessary approvals for the design/mini design of this task
• I have approved the API changes and granular permission patterns (documentation subtask) (For public services only)

[YarinPinyan]

@guyalt3 @zivmessing Please review and approve