fix(vscode): improve codelens if no targets exist for project

[MaxKless]

Before, when there were no targets for a project, we showed this awkward empty codelens. It opens a quickpick with only one action:

Now we directly show the Open Project Details action:

This will be complemented by an improvement to the PDV to show a better empty state in the PDV with links to documentation.

In case you're wondering, it's not possible to just not show a codelens at this point. The codelens is already created (by parsing the json file, has to be quick). Whether there's a target on this project can only be known later in this async project-graph-dependent resolution of the codelens content.

[nx-cloud]

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✅ Successfully ran 6 targets

• nx affected --targets=lint,test,build,e2e-ci --configuration=ci --exclude=nx-console --parallel=3
• nx-cloud record -- ./gradlew ktfmtCheck
• nx-cloud record -- npx nx format:check --verbose --skip-nx-cache
• nx-cloud record -- npx nx show projects --verbose
• nx-cloud record -- ./gradlew projectReportAll
• nx affected --targets=build,test,e2e-ci --configuration=ci --exclude=nx-console --parallel=3

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