feat: Custom Credential Supplier Documentation#10203

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vverman wants to merge 2 commits intoGoogleCloudPlatform:mainfrom

vverman:feat/document-custom-credential-suppliers

Commits on Nov 15, 2025

Added some samples for custom credentials. Including tests.
vverman
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Commits on Nov 16, 2025

Newlines at the end of files and formatting fixes.
vverman
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