Explorer: Order status

[alfetopito]

Description

Align order status with CowSwap.

Several somewhat related issues have been created already, listed below.
Some are likely duplicates

Additional resources

For reference behaviour and implementation, take a look at the CowSwap repo

Feature breakdown
It includes:

• New backend status presignaturePending [presign] Explorer: Status for pre-signing #628
• Unify logic with CowSwap Explorer: Unify logic between CowSwap and Explorer #695
• Order cancelling state Cancel order: Sync statuses in Explorer and CowSwap #612
• Add order cancelling state Add 'Cancelling' status to the order #702

[stale]

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[elena-zh]

Seems to be implemented.