[sovereign] Block finality to zero for extended headers

[mariusmihaic]

Reasoning behind the pull request

• Set block finality to zero for base block tracker processor when checking incoming mainchain headers

Proposed changes

• Whenever receving a new incoming header, the resulted header will be instantly included in the sovereign block. Reason being that notifier only sends finalized mainchain headers, so we do not need block finality = 1 when notarizing incoming headers

Testing procedure

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (feat/sovereign-mainchain-header-sync@ab4e1ac). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
process/track/blockProcessor.go	90.90%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feat/sovereign-mainchain-header-sync #6568 +/- ## ======================================================================= Coverage ? 77.65% ======================================================================= Files ? 953 Lines ? 108816 Branches ? 0 ======================================================================= Hits ? 84497 Misses ? 18499 Partials ? 5820 ```

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