Fix Mautic 7.2 EncryptionHelper injection and cover integration instantiation

[AlexanderZlobinM1]

Mautic 7.2.0 no longer registers mautic.helper.encryption, so this plugin prevents a fresh container from compiling. This fixes the service reference for hCaptcha, reCAPTCHA and Turnstile by registering a plugin-scoped alias for the existing EncryptionHelper service in Config/services.php and using that alias in the legacy integration argument lists.

Fixes #11. Related to #12: I tested its exact commit 39ce1b2ee81141aa800b8876961420b3e96be30a on a Mautic 7.2.0 installation. It fixes container compilation, but creating the integration then fails:

AbstractIntegration::__construct(): Argument #8 ($encryptionHelper) must be of type Mautic\CoreBundle\Helper\EncryptionHelper, string given

Mautic's ServicePass::processArgument() treats arguments containing a backslash as literal class-name strings, so putting EncryptionHelper::class directly in Config/config.php does not inject the service. The local alias avoids that legacy-parser behavior without restoring a global core alias or creating a second helper instance.

The included regression script compiles a fresh container and actually retrieves all three integration services; compilation alone would miss the failure in #12. Its temporary cache is removed afterward. Both legacy argument lists use the same alias; the CAPTCHA logic and existing settings are unchanged.

Validation on a Mautic 7.2.0 / PHP 8.4.23 server:

• Current main (a1c1795): reproduced the missing mautic.helper.encryption error.
• PR Fix service id for EncryptionHelper broken by Mautic 7.2.0 #12 (39ce1b2): reproduced the constructor TypeError above.
• This change: the committed regression script passes for hCaptcha, reCAPTCHA and Turnstile.
• Normal cache:clear --env=prod --no-debug succeeds.
• PHP syntax checks, strict Composer validation and git diff --check pass.

Older Mautic versions and live provider challenge verification have not been runtime-tested in this contribution.

[tvalimaa]

Code looks good and valid