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/cert.ecdsa.pem

@@ -1,12 +1,12 @@
 -----BEGIN CERTIFICATE-----
-MIIB0zCCAXigAwIBAgIQFXjGC57tyhJ/4EFxL51V+jAKBggqhkjOPQQDAjAcMRow
+MIIBxTCCAWqgAwIBAgIQHg296UPzq0FEkJdEzVjrSjAKBggqhkjOPQQDAjAcMRow
 GAYDVQQDExFTbWFsbHN0ZXAgUm9vdCBDQTAeFw0yMTAxMDEwMDAwMDBaFw0zMTAx
 MDEwMDAwMDBaMBkxFzAVBgNVBAMTDlNtYWxsc3RlcCBMZWFmMFkwEwYHKoZIzj0C
-AQYIKoZIzj0DAQcDQgAEtmQYX/Y/trHaCQAn6XBOjhHEWI0Cokb2W9USm+pq5DmH
-VthDa01dSkRz0oE0Hc3eU+1ixGF2xr+WCgqOEPrCY6OBnjCBmzAOBgNVHQ8BAf8E
-BAMCB4AwHQYDVR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMB0GA1UdDgQWBBRI
-xKKyMZucPU29WEVg8MYW63TAOzAfBgNVHSMEGDAWgBQ/PWUacoIWxiDotvwbLm2k
-nCySeDAqBgNVHREEIzAhggxleGFtcGxlLnRlc3SCEW1haWwuZXhhbXBsZS50ZXN0
-MAoGCCqGSM49BAMCA0kAMEYCIQC23H269tmxPyhNbUyk6cUkgNRspfyfdE6au1vK
-il7dMgIhAOLIixu+ovlfzUGMCnVxyum+ZdHKXlB394rA+AN3G1MK
+AQYIKoZIzj0DAQcDQgAE9FsAamrKHbgVgIHQgnK+rzo8XqebZCEWGSfzdQvr4P5H
+amye19qADhsJdkX+i/15CfcIIhqTICF0XniRU0WecaOBkDCBjTAOBgNVHQ8BAf8E
+BAMCB4AwHQYDVR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMB0GA1UdDgQWBBTY
+vlZSJ+eQsCFbX3nY+NSFV/ArvDAfBgNVHSMEGDAWgBTekLO5TcGz7ncAiItp7HHE
+MPn2fzAcBgNVHREEFTATghFtYWlsLmV4YW1wbGUudGVzdDAKBggqhkjOPQQDAgNJ
+ADBGAiEArQh78IJBLg7NK/eV/e5z2ZONdHzvKU3V2jME8LaxaxMCIQDX8ZXbvhi4
+23e5VwfmuVo9ADTT9esYZ5u6v4hicunJmQ==
 -----END CERTIFICATE-----