Add ProductDataEnricher plugin to enrich product pages metadata

[marcwrobel]

With this approach, enriched data is only computed once and available both in layouts and in plugins (such as the APIv1 plugin - see #2080). This make things easier in both places.

validate.py now checks if releaseLabel is a string.

This PR relates to (and conflicts with) #2226.

[marcwrobel]

@captn3m0, this PR is similar yours (#2226), but it contains only computations for what I need in the API (#2080). It works without any change to the product frontmatter (except a minor one for raspberrypi).

I moved the following computations in this plugin

• iconUrl computation (like in your plugin),
• tags-related computation as a preparation for Support tags in endoflife.date #2225 (not in your plugin),
• cycles lts / discontinued default value (not in your plugin),
• cycles link computation with __XXX__ replacements and liquification (not in your plugin),
• cycles label computation with __XXX__ replacements, liquification and LTSLabel management (not in your plugin).

I have made a few test and it looks good enough to be merged IMHO. A few pages to test :

• https://deploy-preview-2239--endoflife-date.netlify.app/devuan and https://deploy-preview-2239--endoflife-date.netlify.app/android for label computation
• https://deploy-preview-2239--endoflife-date.netlify.app/android and https://deploy-preview-2239--endoflife-date.netlify.app/beats for links computation

[captn3m0]

The title attribute on release cycle column seems to be rendering incorrectly:

https://deploy-preview-2239--endoflife-date.netlify.app/android has title=Release Notes / Changelog for

Could you also check for upcoming LTS? (No product has it right now, so test manually)

[marcwrobel]

Could you also check for upcoming LTS? (No product has it right now, so test manually)

Actually there is one, Devuan : https://deploy-preview-2239--endoflife-date.netlify.app/devuan.

[marcwrobel]

The title attribute on release cycle column seems to be rendering incorrectly:

I forgot to replace one releaseCycleText, this is fixed.

[marcwrobel]

Conflicts with the just-merged PR #2157 resolved.

[marcwrobel]

@captn3m0 is it good enough to be merged ?

[captn3m0]

LGTM