chore: make weak-napi optional

[SimenB]

Summary

Discovered we still need this when upgrading to 25 at work.

$ docker run --interactive --tty --rm node:lts-alpine yarn add weak-napi
$ docker run --interactive --tty --rm node:lts-alpine sh -c "apk add --no-cache python && yarn add weak-napi"

You need to install quite a bit of stuff

This is essentially #5252 again

Test plan

Dunno...

[thymikee]

Oh, thought it was already optional, same as weak

[SimenB]

I thought it wasn't needed with napi - I was wrong 😅

#8686 (comment)

[thymikee]

Still a little less code to ship with Jest by default! :D

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@b8a4a85). Click here to learn what that means.
The diff coverage is 40%.

@@            Coverage Diff            @@
##             master    #8869   +/-   ##
=========================================
  Coverage          ?   63.81%           
=========================================
  Files             ?      275           
  Lines             ?    11588           
  Branches          ?     2841           
=========================================
  Hits              ?     7395           
  Misses            ?     3566           
  Partials          ?      627

Impacted Files	Coverage Δ
packages/jest-leak-detector/src/index.ts	83.33% <40%> (ø)

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