Illia malachyn/new execution data tests

[illia-malachyn]

Closes #8059, #7587, #8231, #8135

Changes:

1. No more separate test for a streaming from a spork root block. Any test does it!
2. Result info provider extended with new functionality: it recognizes execution forks now!
3. Removed index from execution data tracker
4. Removed tests for different backfill types as they are not needed.

Streamer streams all available blocks at the start, so either such tests should be there, or they should be removed, since they're basically useless - no matter how many blocks are available, all of them are streamed to the subscription.

5. Introduce a data provider interface instead of a callback.
   Initially, I wanted to do it for testing, so I could easily mock this behavior and write good tests for the backend. However, the problem is that this logic is not injected into the endpoints. Therefore, it is not as useful for the backend tests, but they're useful for the tests in the subscription package (which might be extended/refactored in the [Data Availability] Introduction of a new subscription package #8131). Also, the interface makes it easier to reason about both the backend and subscription packages, as well as their interaction.

Please, review in the following order:
optimistic sync package (changes to result provider + its tests) -> subscription package (changes to streamer and response handler/data provider interface) -> backend -> tests for backend

Note, the tests for events and account statutes MUST fail in this PR, as the result provider and response handler func were significantly changed. We should merge PRs for the events/accounts into this one, then check if CI passes, and only after that we can merge everything into the feature/optimistic_sync

To be done in this PR:

• more tests to TestGetExecutionData
• fix all TODOs
• enhance error handling

[illia-malachyn]

@AndriiDiachuk

[codecov-commenter]

Codecov Report

❌ Patch coverage is 28.57143% with 95 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...executiondatasync/optimistic_sync/mock/pipeline.go	0.00%	31 Missing ⚠️
...utiondatasync/optimistic_sync/mock/core_factory.go	0.00%	16 Missing ⚠️
...ndatasync/optimistic_sync/mock/pipeline_factory.go	0.00%	16 Missing ⚠️
...nc/optimistic_sync/mock/pipeline_state_provider.go	0.00%	15 Missing ⚠️
.../optimistic_sync/execution_result/info_provider.go	84.44%	6 Missing and 1 partial ⚠️
...nc/optimistic_sync/mock/pipeline_state_consumer.go	0.00%	7 Missing ⚠️
.../optimistic_sync/execution_result_info_provider.go	0.00%	2 Missing ⚠️
cmd/access/node_builder/access_node_builder.go	0.00%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[illia-malachyn]

Note: tests are a bit flaky currently. I need to come up with a solution to that.

[illia-malachyn]

@peterargue can u look into that ?

[illia-malachyn]

@peterargue @UlyanaAndrukhiv @AndriiDiachuk, guys, I guess this is ready for review. I'd really appreciate your comments/criticisms. If it feels too clumsy and complex, I can split it up into several smaller PRs.