feat: onSlotFinalized include all previous slots.

[panteleymonchuk]

Description of change

Mark all related blocks as finalized when we get slot index from onSlotFinalized handler.
Closes #1334

Type of change

• Enhancement (a non-breaking change which adds functionality)

How the change has been tested

After handle onSlotFinalized function blocks for current slot Index and before index need to be marked as "finalized"

Change checklist

Add an x to the boxes that are relevant to your changes, and delete any items that are not.

• My code follows the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[VmMad]

Works nice! Only suggestion is renaming some variables :)

[VmMad]

It looks nice, I suggest renaming the variables a bit so it is more easy to understand :)

        const previousFinalizedSlots = Array.from(confirmedBlocksBySlot.keys());
        const allFinalizedSlots = [...previousFinalizedSlots, slotFinalized];
        const confirmedBlocks = [];

        for (const slot of allFinalizedSlots) {
            const confirmedBlockIds = confirmedBlocksBySlot.get(slot);

            if (confirmedBlockIds) {
                confirmedBlocks.push(...confirmedBlockIds);
            }
        }

        if (confirmedBlocks?.length) {
            confirmedBlocks.forEach((blockId) => {
                const finalizedBlockColor = getBlockColorByState(themeMode, "finalized");
                if (finalizedBlockColor) {
                    updateBlockIdToMetadata(blockId, {
                        state: "finalized",
                        color: finalizedBlockColor,
                    });
                    updateBlockColor(blockId, finalizedBlockColor);
                }
            });
        }

        for (const slot of allFinalizedSlots) {
            removeConfirmedBlocksSlot(slot);