Advertise available profiles in directory resource

[aarongable]

Change the way profiles are configured at the WFE to allow them to be accompanied by descriptive strings. Augment the construction of the directory resource's "meta" sub-object to include these profile names and descriptions.

This config swap is safe, since no Boulder WFE instance is configured with CertificateProfileNames yet.

Fixes #7602

No config ticket is necessary at this time, since config changes will be made as part of the larger #7309

[github-actions]

@aarongable, this PR appears to contain configuration and/or SQL schema changes. Please ensure that a corresponding deployment ticket has been filed with the new values.

[aarongable]

The resulting directory resource looks like this:

{
  "keyChange": "http://10.77.77.77:4001/acme/key-change",
  "meta": {
    "caaIdentities": [
      "happy-hacker-ca.invalid"
    ],
    "profiles": {
      "defaultBoulderCertificateProfile": "The normal profile you know and love"
    },
    "termsOfService": "https://boulder.service.consul:4431/terms/v7",
    "website": "https://github.com/letsencrypt/boulder"
  },
  "newAccount": "http://10.77.77.77:4001/acme/new-acct",
  "newNonce": "http://10.77.77.77:4001/acme/new-nonce",
  "newOrder": "http://10.77.77.77:4001/acme/new-order",
  "renewalInfo": "http://10.77.77.77:4001/draft-ietf-acme-ari-03/renewalInfo",
  "revokeCert": "http://10.77.77.77:4001/acme/revoke-cert",
  "xEq2aJUaF48": "https://community.letsencrypt.org/t/adding-random-entries-to-the-directory/33417"
}