chore: Fix transient legacy credential store integ test failure

[vincetran]

• PR title and description conform to Pull Request guidelines.

Issue #, if available: N/A

Description of changes: From the Android documentation for File.listFiles():

There is no guarantee that the name strings in the resulting array will appear in any specific order; 
they are not, in particular, guaranteed to appear in alphabetical order.

This is important because the test is doing a list comparison where order matters and the test failure shows that:
java.lang.AssertionError: expected:<[2924030b-54c0-48bc-8bff-948418fba949, 7e001127-5f11-41fb-9d10-ab9d6cf41dba]> but was:<[7e001127-5f11-41fb-9d10-ab9d6cf41dba, 2924030b-54c0-48bc-8bff-948418fba949]>

How did you test these changes?
Validated no regression

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.