[Update Snap] PolkaGate

[khanti42]

Checklist

All items in the list below needs to be satisfied.

• Is the summary of the change documented in this ticket?
• Has a MetaMask Snaps team member reviewed whether the changes need to be vetted?
• If there are changes that need to be vetted, attach a description and the relevant fixes/remediations to this issue.
• The corresponding pull request in this repo has been merged.

Summary

provide in extension Polkadot Staking (solo and pooled)

diff: PolkaGate/snap@v1.0.1...v2.0.0

see video:

stakeDotWithMetaMask.mp4

[khanti42]

We also remove very old version of the Snap as the builder is targeting >=x on its companion dApp there is no need to keep all the old versions in there. We wanted to keep them because he was not sure of the effect of removing them.