fix(uv): Don't just delete windows whls

[arrdem]

We still can't really support windows. But. We can fix windows-only wheels producing build graphs.

This PR makes two related changes here.

First it ensures that we will never produce an empty selection chain by ensuring that it will always end with an incompatible dummy target, which fixes #754.

Second we add stub Windows platform configuration flags and adjust the wheel filtering to allow for windows.

The net effect here is that although we cannot currently perform windows whl installs due to lack of appropriate interpreters, we can configure the build graph as it would need to be and avoid the analysis errors reported in #754.

Fixes #754.

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

FIXME

Test plan

FIXME

[aspect-workflows]

Bazel 8 (Test)

All tests were cache hits

38 tests (100.0%) were fully cached saving 1m.

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Bazel 9 (Test)

All tests were cache hits

35 tests (100.0%) were fully cached saving 1m 30s.

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Bazel 8 (Test)

e2e

⚠️ Buildkite build #2253 failed.

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Bazel 9 (Test)

e2e

⚠️ Buildkite build #2253 failed.

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Bazel 8 (Test)

examples/uv_pip_compile

All tests were cache hits

1 test (100.0%) was fully cached saving 335ms.

[arrdem]

Blocked on #776 probably.

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