fix(core): ensure project configuration is saved as standalone when workspace.json isn't present

[NathanWalker]

Current Behavior

When a workspace.json is absent, the ng cli adapter may fail with Cannot find configuration.

Expected Behavior

The ng cli adapter will now succeed in this case.

cc/ @AgentEnder

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✅ Successfully ran 12 targets

• nx affected --target=e2e --base=d34dff182535cb1491757b46f76b28663a5d7382 --head=a0b4f229edcfed082a74b88daa80f6fb00531f28 --exclude=e2e-storybook,e2e-storybook-angular,e2e-react-native,e2e-detox,e2e-make-angular-cli-faster --parallel=1
• nx affected --target=test --base=d34dff182535cb1491757b46f76b28663a5d7382 --head=a0b4f229edcfed082a74b88daa80f6fb00531f28 --parallel=1
• nx affected --target=build --base=d34dff182535cb1491757b46f76b28663a5d7382 --head=a0b4f229edcfed082a74b88daa80f6fb00531f28 --parallel=3
• nx-cloud record -- yarn depcheck
• nx affected --target=lint --base=d34dff182535cb1491757b46f76b28663a5d7382 --head=a0b4f229edcfed082a74b88daa80f6fb00531f28 --parallel=3
• nx-cloud record -- yarn nx workspace-lint
• nx-cloud record -- yarn check-lock-files
• nx-cloud record -- yarn check-commit
• nx-cloud record -- yarn nx format:check --base=d34dff182535cb1491757b46f76b28663a5d7382 --head=a0b4f229edcfed082a74b88daa80f6fb00531f28
• nx-cloud record -- yarn check-imports
• nx-cloud record -- yarn documentation
• nx build typedoc-theme

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