Merge Release 3.8.0 to Release 3.9.0 (#2420)

* feat: TG-797, TG-863 Keycloak 7 configuration changes (#2295)

* fix: updating kc vars and conf

* fix: proxy forwarding

* fix: adding TCPPING

* fix: ability to reload theme config without restart

* fix: add a unique node identifier

* fix: updating bind address to IP

* fix: updating gossip to JDBC PING

* fix: add placeholders for owners and heap size

* fix: removed cache evictions

* fix: removed standalone.xml since its not required

* fix: changed info.ftl as per keycloak 7

* fix: adding auto redirect and SB styled buttions

* fix: update default timeout from 5m to 15m

* fix: update pkill command, when service stop fails

* fix: removed whitespaces

* fix: redirect.js breaks login page for google signin

* fix: enable caching of themes as it brings down performance

* fix: typos in comments

* fix: adding auto removal of dead nodes from DB after a crash

* fix: adding keycloak 7 migration script

* fix: fai...