Plugin review URLs reference the raw 'p' value

[jonoaldersonwp]

Opening the 'Reviews' tab on a plugin page (such as ​https://wordpress.org/plugins/akismet/#reviews) reveals, when present, a list of reviews.

For each of these, the title of the review is linked to the page for that URL. However, it looks via a short URL, which redirects to the final URL - e.g., ​https://wordpress.org/support/plugin/?p=11306755 to ​https://wordpress.org/support/topic/good-but-147/.

We should link directly to the final URL instead.

[Otto42]

Generating that final URL from inside the plugin directory is actually not the easiest thing in the world to do, since the plugin directory isn't running bbPress. So the P method was used because it simplifies the code a great deal, and the redirects are considered acceptable for the speed improvements.

[jonoaldersonwp]

No problem, we have bigger priorities. Let's leave this for future consideration when we've made more speed/performance improvements elsewhere to trade against.

[dd32]

In 8474:

Plugin Directory: Link directly to the Reviews rather than using the ?p= syntax.

Fixes #4286.

[dd32]

In 8917:

Plugin Directory: Always link to the 'pretty permalink' of reviews, now that the caches will have cleared.

Amends [8474].
See #4286.