Backport of Fix handling of default zero SignatureBits value with Any key type in PKI Secrets Engine into release/1.10.x

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

Backport

This PR is auto-generated from #14875 to be assessed for backporting due to the inclusion of the label backport/1.10.x.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

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

---

When using KeyType="any" on a role (whether explicitly or implicitly
via a sign-verbatim like operation), we need to update the value of
SignatureBits from its new value 0 to a per-key-type default value. This
will allow sign operations on these paths to function correctly, having
the correctly inferred default signature bit length.

Additionally, this allows the computed default value for key type to be
used for minimum size validation in the RSA/ECDSA paths. We additionally
enforce the 2048-minimum in this case as well.

`Signed-off-by: Alexander Scheel [email protected]

Fix defaults and validation of "any" KeyType

When certutil is given the placeholder any keytype, it attempts to
validate and update the default zero value. However, in lacking a
default value for SignatureBits, it cannot update the value from the
zero value, thus causing validation to fail.

Add more awareness to the placeholder "any" value to certutil.

`Signed-off-by: Alexander Scheel [email protected]

---

Resolves: #14863

This also includes two tests, including one written by @stevendpclark for checking this issue and ensuring we don't regress, one for roles and one for sign-verbatim.

[hashicorp-cla]

Thank you for your submission! We require that all contributors sign our Contributor License Agreement ("CLA") before we can accept the contribution. Read and sign the agreement

Learn more about why HashiCorp requires a CLA and what the CLA includes

---

temp seems not to be a GitHub user.
You need a GitHub account to be able to sign the CLA.
If you have already a GitHub account, please add the email address used for this commit to your account.

_{Have you signed the CLA already but the status is still pending? Recheck it.}

[cipherboy]

Closing this and re-opening manually.