refactor(solana-wallet-snap): remove asset pubkeys

[ulissesferreira]

Summary

We will take 1 step backwards so we can then take 2 steps forward. We need to stop storing a field that the AssetsController can't return. We might lose some performance out of transaction history fetching but this will soon not be a problem when we start getting transaction history from controllers too.

• Remove pubkey from the Solana TokenAsset and NftAsset models.
• Stop copying token account pubkeys into persisted or monitored asset entities.
• Resolve the associated token account address only when fetching transaction history, using the mint token program so Token-2022 remains supported.
• Keep independent account, metadata, saved-history, ATA-resolution, and transaction requests parallel where applicable.

Validation

• Formatting check passed.
• ESLint passed for all changed source and test files.
• Focused Jest execution was blocked because this worktree does not have a built packages/solana-wallet-snap/dist/bundle.js; the local build is also blocked by the current workspace package-resolution state for @metamask/snap-networks-utils.

This PR is based on the latest origin/main.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
88.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[ulissesferreira]

@metamaskbot publish-preview

[github-actions]

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@metamask-previews/bitcoin-wallet-snap@2.0.1-preview-55feb552
@metamask-previews/snap-networks-utils@1.0.0-preview-55feb552
@metamask-previews/solana-wallet-snap@6.0.0-preview-55feb552
@metamask-previews/stellar-wallet-snap@1.0.0-preview-55feb552
@metamask-previews/tron-wallet-snap@3.2.0-preview-55feb552