Backport of Fix Vault managed intermediate PKI bug into release/1.12.x #15577
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Backport
This PR is auto-generated from #15525 to be assessed for backporting due to the inclusion of the label backport/1.12.
The below text is copied from the body of the original PR.
Description
If you are 1) using Vault as a Consul Connect CA, 2) using Vault-managed policies (i.e. you are bringing external existing Vault mounts to use as CA instead of giving Consul privileges to make mounts itself), and 3) have an empty intermediate PKI mount, Consul will fail to startup the CA Manager.
People have gotten around this issue by adding a dummy cert in the intermediate PKI mount but this PR aims to fix the root cause.
Testing & Reproduction steps
Links
Vault as CA reference: https://developer.hashicorp.com/consul/docs/connect/ca/vault#vault-acl-policies
PR Checklist
Overview of commits