fix(sdk): issue where duplicate links were created when existing

[ScriptedAlchemy]

Description

This pull request addresses an issue in the @module-federation/sdk package where duplicate links were created when existing links had no rel attribute. It includes changes to the createLink function and adds a corresponding test to ensure the fix works correctly. Additionally, the changegen script in package.json has been updated to include the sdk package.

Bug Fixes and Tests:

• .changeset/ai-eager-mouse.md: Documented the fix for the issue with duplicate links and added a test in dom.spec.ts to ensure links without rel attribute aren't duplicated.
• packages/sdk/src/dom.ts: Modified the createLink function to treat null and undefined rel attributes as equivalent when checking for existing links.
• packages/sdk/__tests__/dom.spec.ts: Added a test to ensure that a duplicate link is not created when an existing link has no rel attribute and the new link's rel attribute is undefined.

Build and Configuration:

• package.json: Updated the changegen script to include the sdk package.

Related Issue

#3705

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have added tests to cover my changes.
• All new and existing tests passed.
• I have updated the documentation.

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[changeset-bot]

🦋 Changeset detected

Latest commit: ff4685d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 32 packages

Name	Type
@module-federation/sdk	Patch
@module-federation/cli	Patch
@module-federation/devtools	Patch
@module-federation/data-prefetch	Patch
@module-federation/dts-plugin	Patch
@module-federation/enhanced	Patch
@module-federation/esbuild	Patch
@module-federation/managers	Patch
@module-federation/manifest	Patch
@module-federation/modern-js	Patch
@module-federation/nextjs-mf	Patch
@module-federation/node	Patch
@module-federation/retry-plugin	Patch
@module-federation/rsbuild-plugin	Patch
@module-federation/rspack	Patch
@module-federation/runtime-core	Patch
@module-federation/runtime	Patch
@module-federation/storybook-addon	Patch
@module-federation/utilities	Patch
@module-federation/webpack-bundler-runtime	Patch
@module-federation/bridge-react-webpack-plugin	Patch
@module-federation/bridge-react	Patch
@module-federation/bridge-vue3	Patch
@module-federation/modernjsapp	Patch
remote5	Patch
@module-federation/runtime-tools	Patch
@module-federation/inject-external-runtime-core-plugin	Patch
@module-federation/third-party-dts-extractor	Patch
@module-federation/bridge-shared	Patch
@module-federation/error-codes	Patch
create-module-federation	Patch
website-new	Patch

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