Upgrade all manifests to v1 manifest format

manifests/g/GrafanaLabs/GrafanaOSS/7.0.0/GrafanaLabs.GrafanaOSS.yaml

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+PackageIdentifier: GrafanaLabs.GrafanaOSS
+PackageVersion: 7.0.0
+PackageName: Grafana Open Source
+Publisher: Grafana Labs
+License: Apache 2.0
+LicenseUrl: https://github.com/grafana/grafana/blob/master/LICENSE
+Moniker: grafana-oss
+Tags:
+- grafana
+- dashboard
+- prometheus
+- graph
+- metrics
+- visualization
+- data
+- query
+ShortDescription: Grafana allows you to query, visualize, alert on and understand your metrics no matter where they are stored. Create, explore, and share dashboards with your team and foster a data driven culture.
+PackageUrl: https://grafana.com
+Installers:
+- Architecture: x64
+  InstallerUrl: https://dl.grafana.com/oss/release/grafana-7.0.0.windows-amd64.msi
+  InstallerSha256: 16B16092BFCAFEDE140622E57426113C1BD9D6D264E394263C4AF015C70B24A5
+  InstallerType: msi
+  InstallerSwitches:
+    Silent: /quiet /norestart
+    SilentWithProgress: /passive /norestart
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0