Update test suite

[zhiyuanliang-ms]

Why this PR?

Add more testcases & remove unused code

[Copilot]

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

src/feature-management/test/featureManager.test.ts:215

• The 'requirement_type' for 'AnyFeature' is commented out, which might lead to unexpected behavior. Uncomment or explicitly set the 'requirement_type' to ensure the test case is valid.

// "requirement_type": "Any",

src/feature-management/test/variant.test.ts:88

• The error message should specify that the 'from' and 'to' values must be numbers between 0 and 100.

await expect(featureManager.getVariant(Features.VariantFeatureInvalidFromTo, context))