test(cli_util): guard sdkPath in unit tests for hermetic environments

[kevmoo]

In hermetic test runners (such as Blaze/Bazel or environments without
a standard Dart SDK layout on disk at Platform.resolvedExecutable),
sdkPath evaluates to null. Guard the live SDK assertions so tests pass
in hermetic sandboxes.

[github-actions]

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[gemini-code-assist]

Code Review

This pull request modifies the tests in cli_util_test.dart to conditionally execute assertions only when sdkPath is not null, replacing the previous non-null assertions. However, this change causes the tests to pass silently if sdkPath is null, potentially masking configuration issues. It is recommended to explicitly skip the tests using markTestSkipped instead of wrapping the test bodies in conditional blocks.

[github-actions]

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cli_util	✔️ All dependencies utilized correctly.

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Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
cli_util	None	0.6.0	0.6.1-wip	0.6.1-wip	✔️

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[kevmoo]

Needed so https://dart-review.googlesource.com/c/sdk/+/540220 doesn't blow up when we roll into google3

[natebosch]

I think needs a -wip version bump since it was already published?