fix(web-vitals): Add error handling for invalid object keys in `WeakMap`

[github-actions]

Note

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.

[linear]

JS-1461

[github-actions]

A PR closing this issue has just been released 🚀

This issue was referenced by PR #18809, which was included in the 10.34.0 release.