Fix: Use the same event name for the backend receipt event

[ogarciarevett]

This pull request focuses on renaming events in the MiddlewareStakerNativeTokenV1 contract and updating the corresponding test cases. The most important changes include renaming the events to more concise names and ensuring the test cases reflect these changes.

Event Renaming:

• Renamed StakedInMiddleware to Staked in contracts/upgradeables/governance/MiddlewareStakerNativeTokenV1.sol [1] [2].
• Renamed UnstakeInitiatedInMiddleware to UnstakeInitiated in contracts/upgradeables/governance/MiddlewareStakerNativeTokenV1.sol.
• Renamed UnstakedInMiddleware to Unstaked in contracts/upgradeables/governance/MiddlewareStakerNativeTokenV1.sol.

Test Case Updates:

• Updated event name from StakedInMiddleware to Staked in test/hardhatTests/middlewareStaker.test.ts [1] [2] [3] [4] [5] [6].
• Updated event name from UnstakeInitiatedInMiddleware to UnstakeInitiated in test/hardhatTests/middlewareStaker.test.ts.

[openzeppelin-code]

Fix: Use the same event name for the backend receipt event

Generated at commit: 1a7510a470007e6f4ed300d3f9579340df714f4c

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	2 3 0 10 40 55
Dependencies	Critical High Medium Low Note Total	1 0 0 0 0 1

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