docs: Spark Benchmarks on Graviton R-series

[alanty]

What does this PR do?

Adds docs and raw data from our benchmarking on Graviton R-series.

Motivation

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Mandatory for new blueprints. Yes, I have added a example to support my blueprint PR
• Mandatory for new blueprints. Yes, I have updated the website/docs or website/blog section for this feature
• Yes, I ran pre-commit run -a with this PR. Link for installing pre-commit locally

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[alanty]

ah, looks like the docs fail to build as theres a link broken.

#700 adds the running-the-benchmark.md file that looks to be a problem. Can we merge these one after the other to avoid the missing file?

[vara-bonthu]

LGTM