fix(core): make missing output check more comprehensive

[kirjai]

Current Behavior

to determine whether any cached outputs are missing - nx only checks for presence of directories.

Expected Behavior

to determine whether any cached outputs are missing - nx should perform a more comprehensive check.

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this PR adds a small additional check - whether the amount of files in two directories is the same. if not - that means that some output files are missing.

Related Issue(s)

Fixes #

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[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit 44d398e. Click to see the status, the terminal output, and the build insights.

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Status	Command
	nx affected --target=build --base=c4790b8f99c614f658475c97830c505397a642c6 --parallel --max-parallel=3
	nx affected --target=e2e --base=c4790b8f99c614f658475c97830c505397a642c6
	nx affected --target=lint --base=c4790b8f99c614f658475c97830c505397a642c6 --parallel --max-parallel=4
	nx affected --target=test --base=c4790b8f99c614f658475c97830c505397a642c6 --parallel --max-parallel=2
	nx build typedoc-theme

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[statop]

this breaks the ability to specify file outputs - https://github.com/nrwl/nx/pull/3613/files

[github-actions]

This pull request has already been merged/closed. If you experience issues related to these changes, please open a new issue referencing this pull request.