fix: return failure when uninstall fails

[dajiaohuang]

What does this PR do?

Fixes #354. When InstallationProxyClient.uninstall throws, xtool uninstall now returns a nonzero process exit code instead of returning normally with status 0. This matches the failure behavior of the install and development commands, so scripts can distinguish a failed uninstall.

How was it tested?

• git diff --check passed.
• Not run: swift build, swift test, and make lint; this environment has no Swift or Make executable. No runtime/device reproduction was possible here.

AI tool usage

• 0 - No AI was used to write code
• 1 - I was assisted by AI. I reviewed the finished result.
• 2 - I set the AI going and left it to it; nobody has read the result - no review, or AI review only

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[kabiroberai]

or how about we just drop the catch block entirely?