Add support to ts_project() for assets that are generated directly into the outDir

[walkerburgin]

Add support to ts_project() for assets that are generated directly into the outDir.

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Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear below: yes

Test plan

• Covered by existing test cases
• New test cases added

Before this PR the ts-root-out_outputs_test fails because the outDir gets duplicated (root-out/root-out):

==================== Test output for //examples/assets:ts-root-out_outputs_test:
3c3
< examples/assets/root-out/metadata/generated_metadata.json
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> examples/assets/root-out/root-out/metadata/generated_metadata.json
FAIL: files "examples/assets/_expected_ts-root-out_outputs_test.txt" and "examples/assets/_ts-root-out_outputs_test_outputs.txt" differ.
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[aspect-workflows]

Test

1 test target passed

Targets

//examples/assets:ts-root-out_outputs_test [k8-fastbuild] 28ms

Total test execution time was 28ms. 174 tests (99.4%) were fully cached saving 12s.

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