GH-39318: [C++][FS][Azure] Add workload identity auth configuration #39319
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Rationale for this change
Workload identity is a useful Azure authentication method.
What changes are included in this PR?
Implement
AzureOptions::ConfigureWorkloadIdentityCredential
Are these changes tested?
Added a simple test initialising a fileystem using
ConfigureWorkloadIdentityCredential
. This is not the most comprehensive test but its the same as what we agreed on for #39263.Are there any user-facing changes?
Workload identity authentication is now supported.