Prefer pretty permalinks like WP install does

[brandonpayton]

Motivation for the change, related issues

The WordPress installation process defaults to pretty permalinks if it can enable them and get a valid response from a loopback request. Unfortunately, at the time we run the WP installation process in Playground, the PHP request handler has not yet been put into place to handle those requests.

In addition, even if the request handler was in place in time, @adamziel mentioned:

I vaguely remember disabling the networking in installWordPress made for a dramatic installation speedup in web browsers

As a workaround, we can manually set the permalink_structure as part of WordPress installation within bootWordPress().

Closes #1644

Implementation details

Manually sets the permalink_structure as part of WordPress installation within bootWordPress().

Testing Instructions (or ideally a Blueprint)

Manual testing after creating nightly WP build which was pre-installed using this logic using Playground CLI. Loading the nightly build locally shows permalinks enabled.

[brandonpayton]

I made these changes over the weekend but had trouble testing because the following line of bootWordPress() always seems to indicate WordPress has already been installed:

wordpress-playground/packages/playground/wordpress/src/boot.ts

Line 217 in 97abdc6

if (!(await isWordPressInstalled(php))) {

This is something I can look into later.

The change itself seems work fine if we hack bootWordPress() to always run the WP install process.