Removes the requirement of a single chain of issuance from verification

[kitography]

Description

Removes the requirement of a single chain of issuance from verification

TODO only if you're a HashiCorp employee

• Backport Labels: If this fix needs to be backported, use the appropriate backport/ label that matches the desired release branch. Note that in the CE repo, the latest release branch will look like backport/x.x.x, but older release branches will be backport/ent/x.x.x+ent.
  • LTS: If this fixes a critical security vulnerability or severity 1 bug, it will also need to be backported to the current LTS versions of Vault. To ensure this, use all available enterprise labels.
• ENT Breakage: If this PR either 1) removes a public function OR 2) changes the signature
  of a public function, even if that change is in a CE file, double check that
  applying the patch for this PR to the ENT repo and running tests doesn't
  break any tests. Sometimes ENT only tests rely on public functions in CE
  files.
• Jira: If this change has an associated Jira, it's referenced either
  in the PR description, commit message, or branch name.
• RFC: If this change has an associated RFC, please link it in the description.
• ENT PR: If this change has an associated ENT PR, please link it in the
  description. Also, make sure the changelog is in this PR, not in your ENT PR.

[github-actions]

CI Results: failed ❌
Failures:

Test Type	Package	Test	Logs
standard	builtin/logical/pkiext/pkiext_binary	Test_ACME	view test results
standard	builtin/logical/pkiext/pkiext_binary	Test_ACME/group	view test results
standard	builtin/logical/pkiext/pkiext_binary	Test_ACME/group/acme_ip_sans	view test results
standard	builtin/logical/pkiext/pkiext_binary	Test_ACME/group/acme_prevents_ica	view test results
standard	builtin/logical/pkiext/pkiext_binary	Test_ACME/group/acme_wildcard	view test results
standard	builtin/logical/pkiext/pkiext_binary	Test_ACME/group/caddy_http	view test results
standard	builtin/logical/pkiext/pkiext_binary	Test_ACME/group/caddy_http_eab	view test results
standard	builtin/logical/pkiext/pkiext_binary	Test_ACME/group/caddy_tls-alpn	view test results
standard	builtin/logical/pkiext/pkiext_binary	Test_ACME/group/certbot	view test results
standard	builtin/logical/pkiext/pkiext_binary	Test_ACME/group/certbot_eab	view test results

and 14 - 10 other tests