chore(starfish): Remove TODO comment about joining TransactionDigest with BlockDigest

[Copilot]

Description of change

Decision made to keep TransactionDigest and BlockDigest as separate structures rather than merging them.

• Removed obsolete TODO comment in crates/starfish/core/src/block_header.rs referencing issue Join TransactionDigest with BlockDigest #8220

The comment suggested potentially joining the two digest types since they share the same parameters. After evaluation, keeping them separate was deemed the better approach.

Links to any relevant issues

Closes #8220

How the change has been tested

• Basic tests (linting, compilation, formatting, unit/integration tests)
• Patch-specific tests (correctness, functionality coverage)
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

Original prompt

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This section details on the original issue you should resolve

<issue_title>Join TransactionDigest with BlockDigest</issue_title>
<issue_description>We might need to join TransactionDigest with BlockDigest since we use the same parameters for both structures. TransactionDigest is used for including a commitment for a transaction data to a block header. This digest is used for BlockDigest computations of BlockHeader does not include explicitly the transaction data. </issue_description>

<agent_instructions>Let's keep it separate. We need to remove the TODO and a comment.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@piotrm50 Let's keep it separate. We need to remove the TODO and a comment.

• Fixes Join TransactionDigest with BlockDigest #8220

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