After 7.16.2, we'll no longer produce Windows MSI installer packages for Elasticsearch. These packages were previously released in beta and didn't receive widespread adoption.
### Changes:
* Adds a related 7.17 breaking change.
* Adds a related 7.16 deprecation.
* Removes the MSI installation instructions.
* Removes references to the MSI installer.
I plan to port the applicable changes to 8.1 (main), 8.0, 7.17, and 7.16. In the 7.16 ports, I'll leave in the MSI install docs and add related deprecation notes to them instead.
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