fix(core): Trailing slash in outputs array prevents correct caching

[danielsharvey]

Fix by removing trailing slash when performing cp -a into cache.

Add test to confirm fix.

Fixes nrwl/nx#10549

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✅ Successfully ran 12 targets

• nx affected --target=e2e --base=a592af1eb34c3f430cb1828800c4670e1246dec2 --head=4960cdae968d772cfe3683d5cd74fdf7cdab345e --exclude=e2e-storybook,e2e-storybook-angular,e2e-react-native,e2e-detox,e2e-make-angular-cli-faster --parallel=1
• nx affected --target=test --base=a592af1eb34c3f430cb1828800c4670e1246dec2 --head=4960cdae968d772cfe3683d5cd74fdf7cdab345e --parallel=1
• nx-cloud record -- yarn depcheck
• nx affected --target=lint --base=a592af1eb34c3f430cb1828800c4670e1246dec2 --head=4960cdae968d772cfe3683d5cd74fdf7cdab345e --parallel=3
• nx-cloud record -- yarn nx workspace-lint
• nx-cloud record -- yarn check-lock-files
• nx affected --target=build --base=a592af1eb34c3f430cb1828800c4670e1246dec2 --head=4960cdae968d772cfe3683d5cd74fdf7cdab345e --parallel=3
• nx-cloud record -- yarn check-commit
• nx-cloud record -- yarn nx format:check --base=a592af1eb34c3f430cb1828800c4670e1246dec2 --head=4960cdae968d772cfe3683d5cd74fdf7cdab345e
• nx-cloud record -- yarn check-imports
• nx-cloud record -- yarn documentation
• nx build typedoc-theme

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[niklasravnsborg]

Hej @FrozenPandaz @meeroslav, does one of you have the capacity to review this?

[meeroslav]

Once the comments are addressed, we should rebase to the latest version to fix those conflicting files.

[danielsharvey]

@meeroslav @AgentEnder I've made changes as requested and rebased. Thanks.

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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.