test: allow existing sm to be passed in api example

[kierramarie]

Description

A private only example already exists in this repo, so it was just adjusted to allow for an existing secrets manager to be passed in and the test adjusted to use our permanent private only secrets manager.

Git Issue: #73

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[kierramarie]

/run pipeline

[kierramarie]

/run pipeline

[kierramarie]

/run pipeline

[shemau]

LGTM

This is a test-only change, so no release is required.

[kierramarie]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 1.0.3 🎉

The release is available on GitHub release

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