fix(provider): handle v-prefixed SDK versions

[pengqima]

📦 Pull Request

This PR updates isMajorVersionAtLeast to handle SDK version strings prefixed with v or V, such as v19.0.0.

The provider code already uses v-prefixed removal versions in ProductConsolidationMethodRemovalVersions, but the version comparison helper previously parsed those values as NaN. This change normalizes the optional prefix before reading the major version.

✅ Fixed Issues

• N/A

🚨 Test instructions

Ran:

• ../../../node_modules/.bin/jest test/spec/util/isMajorVersionAtLeast.spec.ts --runInBand --coverage=false
• ./node_modules/.bin/prettier --check packages/@magic-sdk/provider/src/util/version-check.ts packages/@magic-sdk/provider/test/spec/util/isMajorVersionAtLeast.spec.ts
• ./node_modules/.bin/eslint packages/@magic-sdk/provider/src/util/version-check.ts packages/@magic-sdk/provider/test/spec/util/isMajorVersionAtLeast.spec.ts
• PKG=@magic-sdk/provider yarn build
• git diff --check

⚠️ Don't forget to add a semver label!

Please 🚨 ONLY ADD ONE 🚨 of the following labels, failing to do so may lead to adverse versioning of your changes when published:

• patch: Bug Fix?

Special Note

Please avoid adding any of the Priority labels as they conflict with the labels above ☝️

[pengqima]

@Ethella @joshuascan Hi, Could you please review this PR at your convenience? Thank you very much.