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/scripts/test.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -o pipefail
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
+
+GO=$1
+GOFLAGS=$2
+PACKAGES=$3
+TESTS=$4
+TESTFLAGS=$5
+GOBIN=$6
+TIMEOUT=$7
+COVERMODE=$8
+
+PACKAGES_COMMA=$(echo $PACKAGES | tr ' ' ',')
+export MM_SERVER_PATH=$PWD
+
+echo "Packages to test: $PACKAGES"
+echo "GOFLAGS: $GOFLAGS"
+
+if [[ $GOFLAGS == "-race " && $IS_CI == "true" ]] ;
+then
+	export GOMAXPROCS=4
+fi
+
+find . -name 'cprofile*.out' -exec sh -c 'rm "{}"' \;
+find . -type d -name data -not -path './data' | xargs rm -rf
+
+$GO test $GOFLAGS -run=$TESTS $TESTFLAGS -v -timeout=$TIMEOUT -covermode=$COVERMODE -coverpkg=$PACKAGES_COMMA -exec $DIR/test-xprog.sh $PACKAGES 2>&1 > >( tee output )
+EXIT_STATUS=$?
+
+cat output | $GOBIN/go-junit-report > report.xml
+rm output
+find . -name 'cprofile*.out' -exec sh -c 'tail -n +2 "{}" >> cover.out ; rm "{}"' \;
+rm -f config/*.crt
+rm -f config/*.key
+
+exit $EXIT_STATUS