Fix Bit Form create-only submission dispatch

[danieliser]

Stacks on #1364 and supports PopupMaker/Pro#144.

Bit Form 3.2.2 fires bitform_submit_success for both new submissions and frontend entry updates. This guard preserves the normalized event for successful creates, including no-storage forms, while excluding both native update AJAX actions. Validation failures remain excluded because the provider never fires its success hook.

Tests:

• vendor/bin/phpunit --configuration tests/php/phpunit.xml --filter FormSubmissionPhases_Test (16 tests, 52 assertions)
• focused PHPCS on changed files

No new hook or public API.

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