feat: use new surface LROs in new surface clients

[bshaffer]

Ensures new surface clients use new surface operations clients for LRO operations by generating a createOperationsClient to override the one in GAX.

alternative to #713 and googleapis/gax-php#571

Depends on googleapis/gax-php#569
Builds on top of #712

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• tests/Unit/ProtoTests/CustomLroNew/out/samples/CustomLroClient/create_foo.php:25, tag customlro_generated_CustomLro_CreateFoo_sync
• tests/Unit/ProtoTests/CustomLroNew/out/samples/CustomLroOperationsClient/cancel.php:25, tag customlro_generated_CustomLroOperations_Cancel_sync
• tests/Unit/ProtoTests/CustomLroNew/out/samples/CustomLroOperationsClient/delete.php:25, tag customlro_generated_CustomLroOperations_Delete_sync
• tests/Unit/ProtoTests/CustomLroNew/out/samples/CustomLroOperationsClient/get.php:25, tag customlro_generated_CustomLroOperations_Get_sync

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