Synchronizer accept forkids that are the same as in database

[joanestebanr]

Closes #3451

What does this PR do?

Check incomming Forkid against Database:

• if equal is skipped
• If equal but differ in BlockNumber, the blockNumber is updated on database

Reviewers

Main reviewers:

• @John
• @Doe

Codeowner reviewers:

• @-Alice
• @-Bob