GHA/macos: enable HTTPS tests with stunnel

- Install stunnel.

- Regenerate certificates (as SecureTransport requires a validity period
  less than 398 days).

- Restart server if it is unresponsive.

- Do not hardcode the SHA-256 base64 public pinned key.

- Ignore test 313 as SecureTransport does not support crl file.

- Ignore tests 1631 and 1632 as SecureTransport is not yet able to shut
  down FTP over HTTPS gracefully.

- Add a CMake target for generating certificates.

Closes #14486

tests/data/test417

@@ -51,31 +51,7 @@ s/^(.*):(.*)[\r\n]*//
 </stripfile>
 <stdout>
 nomnom
------BEGIN CERTIFICATE-----
-MIIERDCCAyygAwIBAgIGDzR1UZ/TMA0GCSqGSIb3DQEBCwUAMGgxCzAJBgNVBAYT
-Ak5OMTEwLwYDVQQKDChFZGVsIEN1cmwgQXJjdGljIElsbHVkaXVtIFJlc2VhcmNo
-IENsb3VkMSYwJAYDVQQDDB1Ob3J0aGVybiBOb3doZXJlIFRydXN0IEFuY2hvcjAe
-Fw0yMjEyMjMxMjIxMzlaFw0zMTAzMTExMjIxMzlaMFQxCzAJBgNVBAYTAk5OMTEw
-LwYDVQQKDChFZGVsIEN1cmwgQXJjdGljIElsbHVkaXVtIFJlc2VhcmNoIENsb3Vk
-MRIwEAYDVQQDDAlsb2NhbGhvc3QwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK
-AoIBAQCrCrAD0Hb+Xs4V3mHV45FvfNa7yiaOeL4mNdGmWfHVPFU+CSzsoNSvDjxa
-orWweFGVYoCAcchOn1lZk0ASsqnOss0Xi58n8+PPI3gG0gYjX5sg7EJ3Zq2kXoK0
-TZRy6hNkcvzLgyzXoYv1LkzTwYiyyJgZX++Y/GKAs2fMHyP8XzjNgm4tltk1k/4p
-omllwN9Fqz+sFxgAgEq3ybq4Xym7xKwWl8xXNBDJNmVsPtiJRcilQoR8Xs0a6PE+
-VbMhD9A2E/LEL7lzQfqHqtxE1mSW5FpQ+Uqf4KLnafStWs86IOWnCeLP6BmhAK6o
-uyICNFyzz7UkTHa/renxuNOGun2TAgMBAAGjggEGMIIBAjAUBgNVHREEDTALggls
-b2NhbGhvc3QwCwYDVR0PBAQDAgOoMBMGA1UdJQQMMAoGCCsGAQUFBwMBMB0GA1Ud
-DgQWBBScl7A9s1Cx9tRx4uvLgOqTfJjMcjAfBgNVHSMEGDAWgBSHy7EzLsFnfnHj
-5StMTaSzbtJbqTAJBgNVHRMEAjAAMEMGCCsGAQUFBwEBBDcwNTAzBggrBgEFBQcw
-AoYnaHR0cDovL3Rlc3QuY3VybC5zZS9jYS9FZGVsQ3VybFJvb3QuY2VyMDgGA1Ud
-HwQxMC8wLaAroCmGJ2h0dHA6Ly90ZXN0LmN1cmwuc2UvY2EvRWRlbEN1cmxSb290
-LmNybDANBgkqhkiG9w0BAQsFAAOCAQEAC4rtaof6cRWIJViFG0oJv0MANZN4DXIU
-MFHik4Oh2hsvqTGut8dMcsJeMiTxlpNw1T+1hYATdTLPDvhdxKIphEMsdYEmEmqg
-y3tXwZJ4hQj6ZFDCe4MCTXkTvGFkTbhr1fGEaxJcaZCtQEfA7d3qimZ+h4UZqonT
-PAhyCKFNY2BbmxeeABKhAFLKeAGIGMftW8fk2eu9P6+SUz/+WFcN/PR7e6JP6blc
-taRSULRWWkSO2dDt3o9+rBxYdluoecmVq4Ud20wTgkqlQRsp9dOW34DRHgB9ujWU
-V4HhCCqBaxwwUDcBGg4mT2vtyVAXNyszP2j+xvAhjOeyeVXyQr0vsA==
------END CERTIFICATE-----
+%strippemfile[%SRCDIR/certs/stunnel-sv.crt]strippemfile%
 </stdout>
 
 </verify>