fix(jest-config): allow collectCoverage to be configured at project level

[hainenber]

Summary

Closes #15588

collectCoverage to be toggled on-off at project level would be pretty handy for folks in monorepo. To implement this, collectCoverage's default value for projects has to be undefined unless specified otherwise.

This only affects --showConfig CLI option as JSON spec doesn't allow undefined value to be printed out so the result will miss collectCoverage value.

Test plan

• Green CI
• UAT passed by affected user in linked GH issue.

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