fix(server,client): use the cf-worker validator on Node when code generation is disallowed

[mertcanaltin]

When Node runs with --disallow-code-generation-from-strings, the server crashes on startup with an EvalError, because the node shim always picks Ajv and Ajv uses new Function. The workerd and browser shims already use the cf-worker validator, so I made the node shim fall back to it when new Function isn't allowed. Nothing changes for normal Node. Added tests for both packages and checked it with the real flag.

[changeset-bot]

🦋 Changeset detected

Latest commit: 5eacc18

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

This PR includes changesets to release 6 packages

Name	Type
@modelcontextprotocol/server	Patch
@modelcontextprotocol/client	Patch
@modelcontextprotocol/codemod	Patch
@modelcontextprotocol/core	Patch
@modelcontextprotocol/server-legacy	Patch
@modelcontextprotocol/core-internal	Patch

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commit: 5eacc18