dovecot: replace solr fts with flatcurve (xapian) (#5680)

* fts-flatcurve: inital implementation

* fts: removed solr from compose.yml

* flatcurve: added heap and proc logic to dovecot

* added logic for update.sh & generate for Flatcurve

* delete old iteration of fts-flatcurve.conf

* updated default fts.conf

* updated .gitignore to exclude fts.conf for further git updates

* Remove autogeneration of fts.conf (disable override)

* cleanup all left solr stuff

* renamed SKIP_FLATCURVE to SKIP_FTS

* cleanup leftovers solr in lang files

* moved lazy_expunge plugin only to mail_plugins

* added fts timeout value

* compose: remove dev image of dovecot

* updated japanese translation

data/web/lang/lang.tr-tr.json

@@ -694,15 +694,12 @@
         "external_logs": "Harici günlükler",
         "history_all_servers": "Geçmiş (tüm sunucular)",
         "in_memory_logs": "Bellek içi günlükler",
-        "jvm_memory_solr": "JVM bellek kullanımı",
         "memory": "Hafıza",
         "online_users": "Aktif kullanıcılar",
         "restart_container": "Yeniden başlat",
         "service": "Servis",
         "show_ip": "Genel IP'yi göster",
         "size": "Boyut",
-        "solr_dead": "Solr başlatılıyor, devre dışı bırakıldı veya öldü.",
-        "solr_status": "Solr durumu",
         "started_at": "Başlangıç",
         "system_containers": "Sistem ve Konteynerler",
         "timezone": "Zaman Dilimi",