fix(core): targets referred to by targetDependencies should be optional by default

[AgentEnder]

Current Behavior

Adding a targetDependency such as below requires that all projects have build-base available

{
  "build": [{
     "target": "build-base",
     "projects": "dependencies"
  }]
}

Expected Behavior

Related Issue(s)

Fixes #

[nx-cloud]

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✅ Successfully ran 7 targets

• nx affected --target=build --base=9c25cd9f59c192f7da98e65ecf8105e2aafce64c --head=c15375de9e2736877ea2577baf8cb64b1dd8bd38 --parallel=3
• nx affected --target=e2e --base=9c25cd9f59c192f7da98e65ecf8105e2aafce64c --head=c15375de9e2736877ea2577baf8cb64b1dd8bd38 --exclude=e2e-detox,e2e-js,e2e-next,e2e-workspace-create,e2e-workspace-integrations,e2e-workspace-core,e2e-react,e2e-web,e2e-angular-extensions,e2e-angular-core,e2e-cli,e2e-nx-plugin,e2e-cypress,e2e-node,e2e-linter,e2e-jest,e2e-a...
• nx affected --target=e2e --base=9c25cd9f59c192f7da98e65ecf8105e2aafce64c --head=c15375de9e2736877ea2577baf8cb64b1dd8bd38 --exclude=e2e-storybook,e2e-react-native,e2e-detox --parallel=1
• nx affected --target=lint --base=9c25cd9f59c192f7da98e65ecf8105e2aafce64c --head=c15375de9e2736877ea2577baf8cb64b1dd8bd38 --parallel=3
• nx affected --target=test --base=9c25cd9f59c192f7da98e65ecf8105e2aafce64c --head=c15375de9e2736877ea2577baf8cb64b1dd8bd38 --parallel=1
• nx build typedoc-theme
• nx run-many --target=build --all --parallel=8 --exclude=docs,nx-dev-data-access-documents,nx-dev-e2e,nx-dev,nx-dev-feature-analytics,nx-dev-feature-conf,nx-dev-feature-doc-viewer,nx-dev-feature-search,nx-dev-feature-storage,nx-dev-feature-versions-and-flavors,nx-dev-ui-commands,nx-dev-ui-common,nx-dev-ui-home,nx-dev-ui-member-card,nx-dev-ui-sponsor...

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[github-actions]

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