Epic: L2 Re-orgs

[just-mitch]

We want to decouple the pending/proven chain from the view of the rollup contract.

Tasks

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1. refactor: Update messages boxes to account for L2 reorgs #7592
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2. feat: Add slot number to header #7594
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3. feat: store log of archives in rollup contract #7615
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4. feat: support prune of the pending chain #7616
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5. feat: Constrain with slot number #7656
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6. Add ECDSA check to L1 contracts #7587
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7. Add attestation validation to L1 contract #7579
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8. feat: Initial validators as part of constructor #8102
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9. refactor: Ignore calls to prune if in devnet #8103
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10. feat: sequential proof publication #8259
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11. feat: archiver to follow "fork-choice" of contract #8457
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12. feat: rollback entire blocks from state #8459
    6 of 12
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13. feat: pxe to follow "fork-choice" of contract #8463
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14. feat: The archiver tells the state synchroniser about unwinding so it can properly sync #8665
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[LHerskind]

Renaming the issue to make it easier for people to follow.