Remove docker hack around prometheus service (#28985)

* Remove uneeded hack in docker-compose now that problem is solved

* Remove obsolete attribute `version` in docker compose configuration files

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

server/build/docker/prometheus-linux.yml

@@ -1,8 +0,0 @@
-global:
-  scrape_interval: 5s
-  evaluation_interval: 60s
-
-scrape_configs:
-  - job_name: 'mattermost'
-    static_configs:
-      - targets: ['172.17.0.1:8067']