Migrate smart contracts extensions to hardhat

[clemsos]

Description

• remove truffle
• cleanup deps
• fix tests

Issues

Relates to discussion in #7446 about upgrading packages

Checklist:

• 1 PR, 1 purpose: my Pull Request applies to a single purpose
• I have commented my code, particularly in hard-to-understand areas
• I have updated the docs to reflect my changes if applicable
• I have added tests (and stories for frontend components) that prove my fix is effective or that my feature works
• I have performed a self-review of my own code
• If my code involves visual changes, I am adding applicable screenshots to this thread

[clemsos]

one thing I dont get here is why this was throwing, when others reverts test were not, such as

unlock/smart-contract-extensions/test/keyPurchaser.js

Lines 44 to 52 in 065eb9e

	await reverts(
	keyPurchaser.readyToPurchaseFor(endUser, constants.ZERO_ADDRESS, []),
	'INSUFFICIENT_ALLOWANCE'
	)
	await reverts(
	keyPurchaser.purchaseFor(endUser, constants.ZERO_ADDRESS, [], {
	from: otherAccount,
	})
	)

[julien51]

Oh well.

[julien51]

Nice!

[julien51]

i think once merged we can trigger a rebase of #6870

[clemsos]

ok will try the rebase then

[julien51]

oh you can just click the checkbox :)

[clemsos]

oh great !