feat: add PooledStaking slice for managing staking state

[amitabh94]

Description

This PR refactors the staking-related state management by introducing a staking redux slice. This change improves state management consistency, reduces duplicate state, and makes the data flow more predictable across the staking feature.

• Created new PooledStaking slice to manage staking-related state
• Refactored hooks to use Redux store instead of local state:
  • usePooledStakes
  • useStakingEligibility
  • useVaultData
  • useStakingEarnings
• Moved hasStakedPositions from usePooledStakes to useStakingEarnings to avoid prop drilling
• Updated tests to reflect new state management pattern

Related issues

Fixes: STAKE-870

Manual testing steps

1. Perform an unstake transaction
2. Navigate to Eth details page while the transaction is still processing
3. You will now see the unstaking banner pop up when transaction is completed without navigating away and coming back to the details page

Screenshots/Recordings

Before

Staking_without_redux.mp4

After

Staking_using_redux.mp4

Pre-merge author checklist

• I’ve followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[github-actions]

Bitrise

✅✅✅ pr_smoke_e2e_pipeline passed on Bitrise! ✅✅✅

Commit hash: c910e77
Build link: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/a241c65b-45ff-4d5b-9f6e-eae0fdf069de

Note

• You can kick off another pr_smoke_e2e_pipeline on Bitrise by removing and re-applying the Run Smoke E2E label on the pull request

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
94.4% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Bitrise

✅✅✅ pr_smoke_e2e_pipeline passed on Bitrise! ✅✅✅

Commit hash: 98523ba
Build link: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/cbd212bb-fd40-46e3-a4ab-f897ba842f5c

Note

• You can kick off another pr_smoke_e2e_pipeline on Bitrise by removing and re-applying the Run Smoke E2E label on the pull request

[Matt561]

Left some question for my own learning but otherwise looks good! 💯

[tommasini]

LGTM!