* Add AzurePipelinesCredential for authenticating an Azure Pipelines service connection with workload identity federation.
* Add unit tests.
* Add comment about not throwing in the ctor, but rather deferring it.
* Order field in order of initialization and fix cspell.
* Fix ambiguous call to EnvironmentOverride in tests.
* Address PR feedback, suppress warning, move oidc fetch in token cache,
and update exception message.
* Address PR feedback, use ID and capitalize Azure Pipelines.
* Revert back to the workaround for the warning, rather than suppressing
it.
* Address PR feedback, move getting an assertion to a helper, and add
const.
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