docs: Update install and run content in APM Overview

[bmorelli25]

elastic/docs#1815 will add shared cloud setup instructions to the documentation repo. These instructions can be reused across all Elastic documentation with tagged regions.

1. We should include this new content, where the Install ES, Install Kib, and Install apm server content currently is, and renumber the steps in the Install and Run guide.
2. The current content should continue to live at the same URLs but should be either nested beneath the new cloud content or moved elsewhere in the list.

The Install APM Agents documentation needs to be updated to include:

• Any new auto instrumentations for each Agent
• A note about API keys (where we reference secret tokens)

The Configure APM documentation needs to be updated with:

• A note about the dynamic badge for configurations that support dynamic reloading

The jump table on the Overview needs to be updated with recently added links

Install APM Server should:

• Step 3: link to https://www.elastic.co/guide/en/apm/server/7.6/apm-server-starting.html

[bmorelli25]

Fixed in #4222 by adding a new Quickstart guide.