implementing regionalized auth and exchangeToken (#14865)

[srushtisv]

Merging into byociam branch to retain prior changes and avoid maintaining multiple branches.

[gemini-code-assist]

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[google-oss-bot]

	1 Warning
⚠️	Did you forget to add a changelog entry? (Add #no-changelog to the PR description to silence this warning.)

Generated by 🚫 Danger

[srushtisv]

Closing—please refer to gcip-byociam