[release/6.0] Use window.document for React-Native

[github-actions]

Backport of #38340 to release/6.0

/cc @BrennanConroy

Use window.document for React-Native

Description

When using React-Native on an Android/iOS device you will see an error when trying to connect: ReferenceError: Can't find variable: document'. This is because our check for using the document variable didn't properly handle environments like React-Native where a window exists but document doesn't.

Fixes #38286

Customer Impact

The SignalR TypeScript library is not usable when upgrading to 6.0 when using React-Native.

I did come up with a workaround that is non-obvious to unblock customers:

if (!globalThis.document) {
  (globalThis.document as any) = undefined;
}

Regression?

• Yes
• No

Regression from 5.0 to 6.0

Risk

• High
• Medium
• Low

Scope of change is small. Made platform checks more robust to avoid unexpected failures when using different frameworks.

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

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