Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/tests/tls_test_cert.pem

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----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+KsY3CacCwonFrGM11mhcliBEGnUGEqNwBUrTkt2opTJ/L3KLFNC65ukg1y4RfFHz
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+vFCqeipS1s8wHwYDVR0jBBgwFoAUxI+gQOaOrxtW+wHGvFCqeipS1s8wDwYDVR0T
+AQH/BAUwAwEB/zANBgkqhkiG9w0BAQsFAAOCAQEAKGXu7u23BMKw0sPjLB9Nu3vp
+0Ova9mflJ4mdI5Y1mClwdN6ysIibC3RDQZbcsz4oEFOh11+z+xLmADhBzEGksuDs
+9ZV2EAOvlFZpsl/2z1ACDq9NF6ru1slspOp2JRr74LIDo2iU4a1ubW6l1NN7bM3d
+2AWjKmeaqwyT80sGVO0ZCYO9QsIgX+WR4SyaY1xUATJEs8gW64jBzcJQSnZZbHjt
+eArVVzwUCAOp1XJhoXP/l9zOg/vtw8PUwb8iPZGK/8UtYTuHgVQUsYr6NAlds4Ag
+IQMsphOLsvz8tXEsQAvd3e0Sz94/oZP1aDUopom9gPDNGOBykuWW0epBfv950A==
+-----END CERTIFICATE-----