Design: Add createRepositoryFlusherImplementation to Bitrix24PartnerRepositoryInterfaceTest (issue #416)

Context

Bitrix24PartnerRepositoryInterfaceTest is an abstract contract test class that SDK consumers extend to verify their implementations of Bitrix24PartnerRepositoryInterface. All other repository contract tests (Bitrix24AccountRepositoryInterfaceTest, ApplicationInstallationRepositoryInterfaceTest, ContactPersonRepositoryInterfaceTest) already declare an abstract createRepositoryFlusherImplementation(): TestRepositoryFlusherInterface method and call $flusher->flush() after every save() / delete() call. Bitrix24PartnerRepositoryInterfaceTest is the only one that is missing this method, making the contract incomplete and leaving repository implementations that require an explicit flush (e.g., Doctrine ORM) untested.

ContactPersonRepositoryInterfaceTest already has the flusher — no changes needed there.

File to Modify

`tests/Application/Contracts/Bitrix24Partners/Repository/Bitrix24PartnerRepositoryInterfaceTest.php`

Change 1 — add import (after the existing use block):

use Bitrix24\SDK\Tests\Application\Contracts\TestRepositoryFlusherInterface;

Change 2 — add abstract method (after createBitrix24PartnerRepositoryImplementation()):

abstract protected function createRepositoryFlusherImplementation(): TestRepositoryFlusherInterface;

Change 3 — update 7 test methods to obtain the flusher and call flush():

Test method	Where to add flusher lines
`testSave`	obtain flusher before save; `flush()` after `save()`
`testSaveWithTwoBitrix24PartnerNumber`	obtain flusher before first save; `flush()` after first `save()`
`testDelete`	obtain flusher before save; `flush()` after `save()` and after `delete()`
`testGetById`	obtain flusher before save; `flush()` after `save()`
`testFindByBitrix24PartnerNumber`	obtain flusher before save; `flush()` after `save()`
`testFindByTitle`	obtain flusher before save; `flush()` after `save()`
`testFindByExternalId`	obtain flusher before save; `flush()` after `save()`

Pattern to follow (from Bitrix24AccountRepositoryInterfaceTest):

$b24PartnerRepository = $this->createBitrix24PartnerRepositoryImplementation();
$flusher = $this->createRepositoryFlusherImplementation();

$b24PartnerRepository->save($b24Partner);
$flusher->flush();

Deptrac Compliance

Changes are confined to tests/. No production source files are modified. No new layer dependencies are introduced.

Verification

make lint-cs-fixer
make lint-rector
make lint-phpstan
make lint-deptrac
make test-unit

B24Phpsdk Laravel Package