65990:Revert changes for removal of /idauth [DONOT-MERGE]

[milujogi]

Revert /idauth changes for https://github.ibm.com/IBMPrivateCloud/roadmap/issues/65990

[ibm-ci-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: milujogi
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[ibm-ci-bot]

Hi @milujogi. Thanks for your PR.

I'm waiting for a IBM member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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