Backport of identity/entity-alias: fix bug where wrong metadata was updated into release/1.9.x #16841
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Backport
This PR is auto-generated from #16838 to be assessed for backporting due to the inclusion of the label backport/1.9.x.
The below text is copied from the body of the original PR.
This fixes a bug in the Identity store where metadata can be leaked between aliases using the same name but have different mount accessors. This also can have adverse effects on Vault performance because it's causing unnecessary entity updates.
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