Don't use the default credential manager while unit testing aside from the default manager tests

Review Request #1922 — Created Oct. 10, 2022 and submitted — Latest diff uploaded

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pidgin/pidgin
default

Reviewers

By using the default credential manager we were messing up other tests, by
using our own instance for each test this no longer is possible.

Ran the unit tests a number of times in a row.

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