[8.14] Add Fleet scaling recommendation: ES API key cache size (backport #1160) #1164
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This updates the Fleet Server scalability page with a scaling tip running a large volume of agents.
Closes: #1156
I also put a link at the top of the page to make sure people can find the scaling recommendations section.
This is an automatic backport of pull request #1160 done by [Mergify](https://mergify.com).