Backport of [VAULT-30189] enos: verify identity and OIDC tokens into release/1.17.x

[hc-github-team-secure-vault-core]

Backport

This PR is auto-generated from #28274 to be assessed for backporting due to the inclusion of the label backport/1.17.x.

The below text is copied from the body of the original PR.

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Description

Expand our baseline API and data verification by including the identity and identity OIDC tokens secrets engines. We now create a test entity, entity-alias, identity group, various policies, and associate them with the entity. For the OIDC side, we now configure the OIDC issuer, create and rotate named keys, create and associate roles with the named key, and issue and introspect tokens.

During a second phase we also verify that the those same entities, groups, keys, roles, config, etc all exist with the expected values. This is useful to test durability after upgrades, migrations, etc.

This change also includes new updates our prior auth/userpass and kv verification. We had two modules that were loosely coupled and interdependent. This restructures those both into a singular module with child modules and fixes the assumed values by requiring the read module to verify against the created state.

Going forward we can continue to extend this secrets engine verification module with additional create and read checks for new secrets engines.

TODO only if you're a HashiCorp employee

• Backport Labels: If this PR is in the ENT repo and needs to be backported, backport
  to N, N-1, and N-2, using the backport/ent/x.x.x+ent labels. If this PR is in the CE repo, you should only backport to N, using the backport/x.x.x label, not the enterprise labels.
  • 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.

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Overview of commits

• 3924128

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