[Sub-Epic] Add an Athena datasource to openscapes' grafana instance

[consideRatio]

Cost data for openscapes is being collected into its AWS accounts Athena instance. This is an epic to overview tasks adding an athena datasource to openscapes' grafana instance at https://grafana.openscapes.2i2c.cloud/.

Tasks

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1. (1/4) Create an IAM Role with relevant permissions (IAM Policy) #4547
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2. (2/4) Make openscapes' grafana pod acquire credentials to assume the IAM Role #4548
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3. (3/4) [Spike] [1h] Add and configure a Athena datasource in openscapes' grafana instance #4549
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4. (4/4) [Spike] [1h] Test Grafana datasource by a query from Grafana #4550
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[yuvipanda]

I believe this was completed