fix(pixel): align build_event with dedup unit tests

The release/3.7.3 -> 3.7.4 merge resolved build_event into a single-template
form (always emitting wcFacebookPixelFiredEvents; if(!(id)||!fired[id])) that
broke FacebookCommercePixelIsolatedExecutionTest:
- test_build_event_adds_browser_dedup_guard_when_event_id_is_present
- test_build_event_does_not_add_browser_dedup_guard_without_event_id

Restore the reviewed if/else behavior (#3939 + Signals Gateway routing):
dedup guard only when an event_id is present, plain fbq/Signals fire when not.
Matches the resolution used merging 3.7.3 into main (#3959).

Updating version to 3.7.3

Updating version to 3.7.2

Merge branch 'fix/fbe-open-redirect' into release/3.7.1

Improve Lead event support for WPForms and Contact Form 7 (#3923)

* fix: WPForms Lead pixel/CAPI flow and remove debug logging

* fix(wpforms): fire CAPI Lead only after successful form submission

* fix(wpforms): replace new Function() with script element injection

* refactor(wpforms): simplify get_event_name method_exists chain

* fix(wpforms): guard ajax listener on WPForms enqueued and fix orphaned test

* fix(wpforms): drop unused params and add space after function keyword

Fixed the issue with tag creation

Updating version to 3.6.2

fix(compat): replace str_ends_with with substr for PHP 7 support

Updating version to 3.6.0

Updating version to 3.5.18