ref: set testdata-db DS for panel plugin

[s4kh]

What this PR does / why we need it:

Configures TestData DB for provisioned panel dashboard .

Which issue(s) this PR fixes:

Fixes https://github.com/grafana/plugin-tools/issues/1112 Fixes https://github.com/grafana/grafana-community-team/issues/243

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[s4kh]

@jackw For the dashboard, we also have https://github.com/grafana/plugin-tools/pull/1282/files#diff-f5a693e0319d1b6e0c9ae180ebcb1aa6241150e9a48377120ec138f303ea91b2R81 config for same panel but scenarioId:no_data_points. Should we change this as well?

[s4kh]

@tolzhabayev @jackw One thing I noticed is if I change the scenario to something else and comeback again at Raw Frame the data is lost, refreshing the page populates the data. It seems the expected behaviour.

It doesn't (maybe should not) add a different scenario within the query, is only replaced - using index with the changed scenario. Change - https://github.com/grafana/grafana/blob/main/public/app/features/query/components/QueryEditorRows.tsx#L50 Change scenario - https://github.com/grafana/grafana/blob/main/public/app/plugins/datasource/grafana-testdata-datasource/QueryEditor.tsx#L87

[grafana-plugins-platform-bot[bot]]

:rocket: PR was released in @grafana/create-plugin@5.9.0, @grafana/plugin-e2e@1.12.0, website@3.5.0 :rocket: