CLD-6867 E2E Tests - Decouple cycle creation from test running (#25367)

* Separate test cycle generation from test running

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

e2e-tests/.ci/server.start.sh

@@ -3,12 +3,6 @@ set -e -u -o pipefail
 cd "$(dirname "$0")"
 . .e2erc
 
-BRANCH_DEFAULT=$(git branch --show-current)
-export BRANCH=${BRANCH:-$BRANCH_DEFAULT}
-BUILD_ID_DEFAULT=$(date +%s)
-export BUILD_ID=${BUILD_ID:-$BUILD_ID_DEFAULT}
-export CI_BASE_URL="${CI_BASE_URL:-localhost}"
-
 # Cleanup old containers, if any
 mme2e_log "Stopping leftover E2E containers, if any are running"
 ${MME2E_DC_SERVER} down -v --remove-orphans