Replace certs with a 20 year expiry (elastic#14427) (elastic#14429)

Backports the following commits to 7.x:
 - Replace certs with a 20 year expiry  (elastic#14427)

heartbeat/monitors/active/http/testdata/client_cert.pem

@@ -1,14 +1,23 @@
 -----BEGIN CERTIFICATE-----
-MIICGzCCAXygAwIBAgIRANIf32fETNS13JB39JYszmwwCgYIKoZIzj0EAwQwEjEQ
-MA4GA1UEChMHQWNtZSBDbzAeFw0xODExMDgwMzIxNDlaFw0xOTExMDgwMzIxNDla
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+VR4Yyz7XOjNjyb4JjQFwGZQY6i+53ccZsH2ZpLgHFKgWxY8Ccc/vYOiKLtOWJsi9
+ktXiNStyktadUe7DekvhKIkOsLXcEIO2eim+grDSNfP8G3hdpw2aK8GgwpwEJapJ
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+PgrftqCrMpMK15vnWJ1er2Rz1bb1
 -----END CERTIFICATE-----

heartbeat/monitors/active/http/testdata/client_key.pem

@@ -1,7 +1,28 @@
------BEGIN EC PRIVATE KEY-----
-MIHcAgEBBEIB1YnGgQ42OFGz1rOFlmT97JB52b9/2h1dj85QaBLxX6isSNgnS7yC
-VQKAQCudJz+UpqiTNZBQK0goqbD/O47lswagBwYFK4EEACOhgYkDgYYABAE+n/OJ
-oo7jvetm8zR4lAX2s99fxWF/LiOR1/qTPQgLmLYVUZq1yTZB027GtJGWAqphkY/n
-0oNdxS4N9d2JPoaXMgHMGZAXl0A85Q3D5k0xKG/jwaEasTIbTe6UKHed2ZgkCtEq
-utG9KwmnqAHCtlia14mgcERpO1eT0A7NRcdtNlcjlA==
------END EC PRIVATE KEY-----
+-----BEGIN PRIVATE KEY-----
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+0vZNVig+zHx8c/eRSxj+C2WiFKmZoe/wIVtVhEqy1SVruKhqhzkKcnHH0Xr/rttN
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+zbwL4kutUOF8PdHdCgTht+z5SR1oAjT/Joz5BlekVh1rhkDMLeeZWe/VO7ochabi
+ORVoeRbPyJN9mX8JkQ+/7X8=
+-----END PRIVATE KEY-----

heartbeat/monitors/active/http/testdata/openssl_command.txt

@@ -0,0 +1 @@
+openssl req -x509 -sha256 -nodes -days 7300 -newkey rsa:2048 -keyout privateKey.key -out certificate.crt