feat: add martech plugin to connect to analytics and target

[ramboz]

This PR adds integration with Target, Launch & ACDL via the martech library. It also moves the Analytics instrumentation to the martech library, and creates a more generic loader to combine the GTM and WebSDK logic and isolate it from the main scripts.js file.

At a high level:

• lib-analytics.js is renamed to lib-martech-loaded.js
  • inline scripts are changed to direct execution to avoid HTML parsing
  • consent is updated to v2 API
  • conversion, GTM, alloy and click trackings are all moved to the martech loader
  • launch and analytics envs will be mapped as follows:
    • *.petwatch.com => prod
    • *.live / *.page urls => stage
    • everything else => dev
  • a new trackAnalyticsEvent method is exported to specifically track events in Analytics instead of GTM
  • updates alloy.js to v2.21.1
• Adobe martech library is add as plugins/martech
• head.html gets new preload/preconnect links for resources immediately imported, so we don't have to wait for scripts.js to be parsed.

Test URLs:

• Before: https://main--24petwatch--hlxsites.hlx.live/
• After: https://martech-lib--24petwatch--hlxsites.hlx.live/

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Commits

* [0291d5b](https://github.com/hlxsites/24petwatch/commit/0291d5b5d1d966cb8ef69f05dd045d850b21ac25) :white_check_mark: (latest) * [668c1a0](https://github.com/hlxsites/24petwatch/commit/668c1a04c5a75bf4ab5fc43bd726b7a932a38422) :white_check_mark: * [37f98f1](https://github.com/hlxsites/24petwatch/commit/37f98f1a314f1d17501177a6d5f8d55a645b9d92) :white_check_mark: * [4ffb282](https://github.com/hlxsites/24petwatch/commit/4ffb282fc600f9f38ff2a7e34dcc98cbbf8ed14d) :white_check_mark: * [67b8ecf](https://github.com/hlxsites/24petwatch/commit/67b8ecf2a468ecac54f1abb70549b55d403101ae) :white_check_mark: * [4874a59](https://github.com/hlxsites/24petwatch/commit/4874a59c40103b61e22bdaa015324660ff974b6f) :white_check_mark:

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[ramboz]

@fe-lix- @ekremney @bohnertchris Since I did quite some heavy lib-analytics.js refactoring for this, if you know the various analytics events they were tracking before, could you perform a quick sanity check to make sure we didn't lose anything along the way?

[ekremney]

@ramboz it has been almost 1 year since the custom analytics events were implemented for this project. I am afraid I cannot recall all the details. The most important events were tracked by GA4 via trackGTMEvent