Helm chart and service hardcode Oracle DB client version. Should be dynamic.

[junior]

Currently Helm chart and service hardcode Oracle DB client version.

This affects the wallet location, the volume for the wallet and the bin folder where the tools are located.

We should either use a variable to select the version and update the dbtools image to use version tag matching the instantClient or create symlinks that will be generic to the chart, no matter which version of the instant client is used.

Reminding that greater version of the client is backwards compatible with "old" DB versions, so, there's no need to have multiple versions support.