MixedDatasource: Shows retrieved data even if a data source fails #27024
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What this PR does / why we need it:
This PR makes sure that any successful data fetched by MixedDatasource is shown although other data sources are failing. The error will show the first error (enhanced with the data source name) but we could tweak this if we want to show all erroneous data sources in the message.
Which issue(s) this PR fixes:
Fixes #26955
Special notes for your reviewer:
You can use this dashboard with TestData and Postgres as a starting point: https://gist.github.com/hugohaggmark/d6ba274ec21085fa34a358a6f8a2b4a6