tests(chore): Adjust supported FQDNs in test certs + add wildcard and acme.json configs (#2284)

These files will replace the existing `test/config/letsencrypt` content which has some random provisioned FQDN for letsencrypt that doesn't match the FQDN tested, `acme.json` files with FQDNs that don't match those certs FQDNs and changes to certs that won't expire until 2031. `test/config/letsencrypt` will be removed with the associated test update PR.

The changes amount to:

- Re-configuring the FQDN values that some certs were created for (_needed for flexibility in testing_).
- Adding an `*.example.test` wildcard (_both RSA and ECDSA_).
- Adding `acme.json` encoded versions (_traefik extraction support will use these instead_).
- Updated / new internal docs for maintainers of this content.

For more detailed information on those changes, please see the associated commit messages via the PR.

test/test-files/ssl/example.test/with_ca/ecdsa/wildcard/cert.ecdsa.pem

@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----
+MIIBwjCCAWegAwIBAgIQC5WvY64DqQ871aanQBM0FjAKBggqhkjOPQQDAjAcMRow
+GAYDVQQDExFTbWFsbHN0ZXAgUm9vdCBDQTAeFw0yMTAxMDEwMDAwMDBaFw0zMTAx
+MDEwMDAwMDBaMBkxFzAVBgNVBAMTDlNtYWxsc3RlcCBMZWFmMFkwEwYHKoZIzj0C
+AQYIKoZIzj0DAQcDQgAEL0RzFOTomoihloK+8+WLlKSK7BjBc4bPFYroBb1Gcc+h
+vTaE0LizFfRz4lOHDc3opUKalJHYo9Th0Xday9qJ6qOBjTCBijAOBgNVHQ8BAf8E
+BAMCB4AwHQYDVR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMB0GA1UdDgQWBBTK
+oJW+WHNsHepQuL80/9PxYzMfbzAfBgNVHSMEGDAWgBTekLO5TcGz7ncAiItp7HHE
+MPn2fzAZBgNVHREEEjAQgg4qLmV4YW1wbGUudGVzdDAKBggqhkjOPQQDAgNJADBG
+AiEA8lDAtckk5ek2pns1XTinfYGvAvyd/Xn0LUyKBFVEqDoCIQCxLdIlGC01GSCX
+ePHVGJ8R1Zep3GSVKmydTnhpwZIjIw==
+-----END CERTIFICATE-----

test/test-files/ssl/example.test/with_ca/ecdsa/wildcard/ecdsa.acme.json

@@ -0,0 +1,29 @@
+{
+    "le": {
+      "Account": {
+        "Email": "acme@example.test",
+        "Registration": {
+          "body": {
+            "status": "valid",
+            "contact": [
+              "mailto:acme@example.test"
+            ]
+          },
+          "uri": "https://acme-v02.api.letsencrypt.org/acme/acct/0123456789"
+        },
+        "PrivateKey": "x",
+        "KeyType": "EC256"
+      },
+      "Certificates": [
+        {
+          "domain": {
+            "main": "Smallstep Leaf",
+            "sans": ["*.example.test"]
+          },
+          "certificate": "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",
+          "key": "LS0tLS1CRUdJTiBFQyBQUklWQVRFIEtFWS0tLS0tCk1IY0NBUUVFSUNSSk9mUGVPSVVvNXl3RW52S0R6dkVJMUtQejV2ZjFrNno5bUN0MlBwYzlvQW9HQ0NxR1NNNDkKQXdFSG9VUURRZ0FFTDBSekZPVG9tb2lobG9LKzgrV0xsS1NLN0JqQmM0YlBGWXJvQmIxR2NjK2h2VGFFMExpegpGZlJ6NGxPSERjM29wVUthbEpIWW85VGgwWGRheTlxSjZnPT0KLS0tLS1FTkQgRUMgUFJJVkFURSBLRVktLS0tLQo=",
+          "Store": "default"
+        }
+      ]
+    }
+  }

test/test-files/ssl/example.test/with_ca/ecdsa/wildcard/key.ecdsa.pem

@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEICRJOfPeOIUo5ywEnvKDzvEI1KPz5vf1k6z9mCt2Ppc9oAoGCCqGSM49
+AwEHoUQDQgAEL0RzFOTomoihloK+8+WLlKSK7BjBc4bPFYroBb1Gcc+hvTaE0Liz
+FfRz4lOHDc3opUKalJHYo9Th0Xday9qJ6g==
+-----END EC PRIVATE KEY-----