Remove unused mock contracts from SafeToL2Migration tests

[mmv08]

This pull request focuses on cleaning up the SafeToL2Migration.spec.ts test file by removing unused imports and redundant mock setup code. These changes streamline the test setup and improve code readability.

Code cleanup and simplification:

• Removed the unused getMock import from test/libraries/SafeToL2Migration.spec.ts.
• Deleted the setup and usage of validGuardMock and invalidGuardMock in the SafeToL2Migration library tests, as they were not used in the actual tests. [1] [2]

[coveralls]

Pull Request Test Coverage Report for Build 11072382278

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.571%

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Totals
Change from base Build 11068302053:	0.0%
Covered Lines:	396
Relevant Lines:	408

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💛 - Coveralls