fix: remove getMinimumBalanceForRentExemption from the codebase

[ghgoodreau]

Explanation

Removes the usage of getMinimumBalanceForRentExemption from the bridge controllers.

References

Fixes: MetaMask/metamask-extension#34971

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

---

Note

BREAKING — Removed Solana rent‑exemption min balance integration

• Delete minimumBalanceForRentExemptionInLamports from BridgeController state and metadata; remove related reset/update paths
• Remove selectMinimumBalanceForRentExemptionInSOL selector and its export from index.ts
• Remove snaps utilities getMinimumBalanceForRentExemptionRequest and getMinimumBalanceForRentExemptionInLamports; keep computeFeeRequest
• Strip #setMinimumBalanceForRentExemptionInLamports and the non‑awaited call from bridge-controller.ts; drop isSolanaChainId import usage
• Update tests and snapshots to exclude the removed state/requests; delete failing/rent‑exemption specific test blocks
• Documented in CHANGELOG.md under Removed

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[micaelae]

Can you mark this as a breaking change? Clients will need to update their tests when upgrading the controller