Added s2s policy for Event Notifications

[kierramarie]

Description

The auth policy isn't to be needed to configure the event notifications integration, however without it, events won't flow to the instance.

Git Issue: #197

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[kierramarie]

/run pipeline

[kierramarie]

/run pipeline

[kierramarie]

/run pipeline

[kierramarie]

Opened provider issue: IBM-Cloud/terraform-provider-ibm#5890

[ocofaigh]

I found that running the tests sequentially worked locally. Might be worth trying as a temp workaround