fix Grafana commit changes

[ebattat]

Type of change

Note: Fill x in []

• [x] bug
• [ ] enhancement
• [ ] documentation
• [ ] dependencies

Description

The current code does not check for changes in 'main.libsonnet' or 'dashboard.json', which means that no commits are made for those files. Current code check properly changes in those file and commit it if needed. In addition, add separate code change for each file 'main.libsonnet' or 'dashboard.json'.

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