Change GTM ID on trac properties to match the rest of the ecosystem

[jonoaldersonwp]

Almost all *.wordpress.org properties use Google Tag Manager to implement and manage our Google Analytics tracking.

*.trac.wordpress.org domains, however, use a different container ID (GTM-5Z8B3BX), and a different GA account. This results in session fragmentation, and the erasure of referrer data in all cases where users navigate between the sites / GA accounts. It also means that trac sites don't undergo the same level of sanitisation, processing and privacy handling that other dot org sites do.

We should, therefore, update all Trac GTM IDs to use the primary container (GTM-P24PF4B), which will consolidate all of the data into a single GA account.

I'm assuming that nobody is actively using/looking at the dedicated Trac Google Analytics account, and that nobody will mind terribly if it goes stale moving forward (especially given that the data will be more integrated, in its new home).

[joostdevalk]

This was fixed!