fix(shellcheck): add deps as source inputs

[yaroslavvoloshchuk-codaio]

Summary

• add deps files as ShellCheck action inputs so sourced sh_library files are available in the sandbox
• keep the ShellCheck command line limited to the target's direct srcs, so deps are extra source inputs rather than double-linted arguments
• add a shell example regression that proves a target can source a dep cleanly while the dep is still linted on its own target

Testing

• cd examples/shell && USE_BAZEL_VERSION=8.x bazel test //test:shellcheck_sourced_main //test:sourced_main_machine_output_empty_test
• cd examples/shell && USE_BAZEL_VERSION=8.x bazel test //test:shellcheck_sourced_dep //test:sourced_dep_machine_output_test //test:sourced_dep_machine_output_test.uri
• cd examples/shell && USE_BAZEL_VERSION=8.x bazel test //test:all
• cd examples/shell && USE_BAZEL_VERSION=8.x bazel build --config=lint --output_groups=rules_lint_human //...
• cd examples/shell && USE_BAZEL_VERSION=8.x bazel build --config=lint --output_groups=rules_lint_patch --@aspect_rules_lint//lint:fix //...

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[aspect-workflows]

Bazel 7 (Test)

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Bazel 8 (Test)

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6 tests (100.0%) were fully cached saving 1s.

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Bazel 9 (Test)

All tests were cache hits

6 tests (100.0%) were fully cached saving 1s.