Backport of Remove caseSensitivityKey invalidation into release/1.12.x #21877
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Backport
This PR is auto-generated from #20965 to be assessed for backporting due to the inclusion of the label backport/1.12.x.
The below text is copied from the body of the original PR.
Jira issue: https://hashicorp.atlassian.net/browse/VAULT-16845
Ent PR: https://github.com/hashicorp/vault-enterprise/pull/4233
A problem occurs when the caseSensitivityKey is invalidated due to a change in its value from True to False in storage, and duplicate groups are discovered. As a result, the loadGroups function returns an error, preventing the loading of groups and potentially causing missing groups in the memDB.
To resolve this issue, the proposed solution is to eliminate the invalidation case for the caseSensitivityKey. Since the value in storage can only be changed on the primary active node during initialization, there is no need for further invalidation. A warning is anyways being logged in loadIdentityStoreArtifacts function during the unseal process before initialization, if duplicate groups are encountered.
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