[DX] Collect Telemetry data on Web Server.

[quicksketch]

Description of the need

In addition to PHP version, MySQL version, and Server OS, we should collect web server: Apache or nginx (supported platforms) as well as other options (either consolidated into "Other" or separated).

Proposed solution

Add Web Server into system_telemetry_data().

Part of meta issue #5231.

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translation update:

New strings:

• Web server
• The web server that delivers HTTP pages to the web browser, such as Apache or nginx.

[quicksketch]

PR filed at backdrop/backdrop#3882 that segments into the following:

• Apache
• nginx
• Other

I'm not sure if we should try and identify other options individually or not. Backdrop officially supports Apache and nginx. Other webservers that could run Backdrop and are above 1% web usage are Litespeed and IIS according to https://w3techs.com/technologies/overview/web_server

Options like "Cloudflare Server" and "Google Server" I believe are not application servers but merely reverse proxy caches that site in front of the application server.

[klonos]

This metric would help in issues like #5047 #4743 #4335, but if the "other" metric is consistently considerably below 20%, then I don't see how it would matter to dig further into which these "other" web servers are 🤷🏼

[klonos]

Thanks @quicksketch 🙏🏼 ...this is RTBC, but I've left a comment in the PR re using title case for Web Server.

[laryn]

Thanks @quicksketch for filing and fixing, and @klonos for the review! Merged into 1.x and 1.20.x.