Move db-init-scripts out of Helm chart

[meysholdt]

Is your feature request related to a problem? Please describe

As a preparation to delete the helm chart (#9842) move the chart/config/db/init out of the helm chart because they are still needed elsewhere.

They are needed by:

• The db-migrations:
  

  gitpod/components/gitpod-db/BUILD.yaml

  Line 50 in 4e33131

  - chart/config/db/init:init-scripts

• The installer also has references. Not sure if it consumes the scripts directly or just has references into the db-migrations component:
  

  gitpod/install/installer/pkg/components/database/init/constants.go

  Line 12 in 4820e80

  sqlInitScripts = "db-init-scripts"

  
  

  gitpod/install/installer/pkg/components/database/incluster/constants.go

  Line 13 in 4820e80

  SQLInitScripts = "db-init-scripts"

Describe the behaviour you'd like

Remove files related to db-init from the chart/ folder so that the chart/folder can be safely deleted.

[geropl]

This has already been done with the helm chart removal PR.