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

Release required?

• No release
• Patch release (x.x.X)
• Minor release (x.X.x)
• Major release (X.x.x)

Release notes content

Run the pipeline

If the CI pipeline doesn't run when you create the PR, the PR requires a user with GitHub collaborators access to run the pipeline.

Run the CI pipeline when the PR is ready for review and you expect tests to pass. Add a comment to the PR with the following text:

/run pipeline

Checklist for reviewers

• If relevant, a test for the change is included or updated with this PR.
• If relevant, documentation for the change is included or updated with this PR.

For mergers

• Use a conventional commit message to set the release level. Follow the guidelines.
• Include information that users need to know about the PR in the commit message. The commit message becomes part of the GitHub release notes.
• Use the Squash and merge option.

[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