Refresh legacy Azure AD links and branding to Microsoft Entra targets (#37512)

* Initial plan

* Refresh legacy Azure AD links/text to Microsoft Entra targets

Co-authored-by: wadepickett <10985336+wadepickett@users.noreply.github.com>

* Edit sweep.

* Fix individual authentication metadata date

Co-authored-by: wadepickett <10985336+wadepickett@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Wade Pickett <wpickett@microsoft.com>

* Apply suggestion from @wadepickett

* Update reviewer and date in JWT bearer authentication doc

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: wadepickett <10985336+wadepickett@users.noreply.github.com>
Co-authored-by: wadepickett <wpickett@microsoft.com>

Author: Copilot