Backport of Preserve CARoots when updating Vault CA configuration into release/1.15.x #16626
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Backport
This PR is auto-generated from #16592 to be assessed for backporting due to the inclusion of the label backport/1.15.
The below text is copied from the body of the original PR.
Description
If a CA config update did not cause a root change, the codepath would return early and skip some steps which preserve its intermediate certificates and signing key ID. This commit re-orders some code and prevents updates from unnecessarily generating new intermediate certificates if one exists.
Testing & Reproduction steps
Links
Fixes #16580
Fixes #14564
PR Checklist
Overview of commits