fix(web-vitals): Add error handling for invalid object keys in WeakMap #18810
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The pull request "fix(web-vitals): Add error handling for invalid object keys in WeakMap" was created by @s1gr1d but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.
A customer experienced the following issue on iOS Safari 18.6.2: TypeError: WeakMap keys must be objects or non-registered symbols.
The culprit is probably in web vitals initUnique function (which is vendored in).
This fix adds a try/catch to handle edge cases where invalid keys are passed to WeakMap, returning a new instance without caching when validation fails.
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