Require the betas of the Meta Conversions API bundle and SDK

[loevgaard]

Moves the plugin to the betas of the Meta Conversions API bundle (v1.0.0-beta.1) and SDK (v2.0.0-beta.3).

Why the constraints change, not just the lock

v2.0.0-beta.2 of the SDK replaced Parameters::PAYLOAD_CONTEXT_* with the PayloadContext enum. v1.0.0-alpha.1 of the bundle still uses the constants, and its own constraint allows the SDK betas. v3.0.0-beta.2 of the plugin allows all of them (^1.0@alpha, ^2.0@alpha), so:

• a fresh install resolves to the pair that works, bundle beta.1 with SDK beta.3, but
• composer update setono/meta-conversions-api-php-sdk on its own leaves bundle alpha.1 with SDK beta.3. Reproduced here: ServerSideTrackingTest fails with Undefined constant Setono\MetaConversionsApi\Event\Parameters::PAYLOAD_CONTEXT_BROWSER.

The constraints are now ^1.0.0-beta.1 and ^2.0.0-beta.2, the first releases that work together. It is a lower bound rather than an @beta flag on purpose: a stability flag on a dependency's requirement is ignored when the plugin is installed into a shop, a lower bound is not. Checked with composer/semver: bundle alpha.1 and SDK alpha.3 / beta.1 no longer satisfy them.

The plugin's own code

Unchanged. Nothing in src/ uses what the SDK betas changed: the Event subclasses only override the constructor, not getMapping(), and nothing touches the payload context, User::$fbc / $fbp or Fbp::$randomNumber.

Docs

The install commands in the README and UPGRADE.md ask for @beta instead of @alpha, and UPGRADE.md tells those who installed v3.0.0-beta.2 to change the flags and update the plugin, the bundle and the SDK together.

Verified locally (PHP 8.3)

• Highest (bundle beta.1, SDK beta.3): composer validate --strict, composer normalize --dry-run, ECS, PHPStan, Rector, lint:container, 76 unit and 15 functional tests.
• Lowest allowed pair (bundle beta.1, SDK beta.2): PHPStan and both test suites.
• Smoke test on the dev server: the pages return 200 and render the pixel init, PageView and ViewContent, which is the client side path that alpha.1 broke.
• Infection was not run again: src/ and the tests are unchanged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f7ea374) to head (b23b1c5).

Additional details and impacted files

@@             Coverage Diff             @@
##                 3.x       #90   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       113       113           
===========================================
  Files             25        25           
  Lines            410       410           
===========================================
  Hits             410       410           

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