fix(opendesk-jitsi): Element's guest user in Jitsi meeting

This PR is created mainly to fix the guest user permission in Jitsi meetings. It also fixes and improves the followings:

• update the image tags to get the latest stable version of Jitsi which contains our fixes
• update Jitsi-Helm's version
• update jitsi-keycloak-adapter version
• set the user level as guest in Jitsi meeting if she is a guest user in the related Element room
• remove the blank lines from SVGs generated by Helm Charts. They break the file format.
• use the new toolbarButtons property in Jitsi UI while customizing buttons
• fix file permissions of the background image
• skip the Jitsi prejoin page after Keycloak redirection since the user already clicked for joining
• fix code formats of provided Javascript files