[BACKUP][GRAFANA] Grafana dashboards backup solution does not suit RS operation need.

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Environment:

• Platform: OPS Orange Cloud
• Configuration: OPS
• Infrastructure v1.5.0

Current Behavior: With v1.5 infrastructure:

• Dashboards are restored automatically with operator.
• When the Grafana POD restarts, if a change or a new dashboards has been created without updating operator, IT IS LOST.

With current way of backup/restore Grafana dashboard we face following difficulties : 1) We have 10 minutes to update GitHub configuration before being overwriting by the operator mechanism. We can choose an other period, but we can eliminate the risk to be overwritten. #377
2) We have difficulty to build the right YAML operator for each dashboard (character to be escaped, I experiment loss of information on dashboard after operator run). #608 3) During OPS and IVV activities, we are updating dashboards around 30 times / day.

=> This way of backup / restoring dashboard is not operational for RS operators and engineers.

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System_CCB_2023-w30 : This story is a nice to have. Not implemented for RS Phase I.