fix(windows platform): correct stop/start state checks and add configurable stop timeout

[iMithrellas]

Summary

This PR fixes Windows service control state checks in the start/stop paths and improves shutdown behavior.

• Corrects conditional logic in service state checks that could previously never evaluate false.
• Ensures vector service stop waits until the service reaches Stopped before returning.
• Adds --stop-timeout to vector service stop and vector service uninstall to make shutdown wait duration configurable.

Vector configuration

Used standard Windows service installation flow with existing Vector service configuration.
No config schema changes were required for this PR.

How did you test this PR?

• Ran cargo fmt --all.
• Manually tested Windows service control commands on Windows:
  • vector service stop --stop-timeout <seconds>
  • vector service uninstall --stop-timeout <seconds>
  • Internal install/uninstall/update scripts now work as expected.
• Verified behavior matches expected service lifecycle transitions and completes successfully.

Change Type

• Bug fix
• New feature
• Dependencies
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

Notes

Includes changelog fragment:

• changelog.d/windows_service_stop_state_wait.fix.md
  Implementation was prepared with LLM assistance; please review carefully.

[github-actions]

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[iMithrellas]

I have read the CLA Document and I hereby sign the CLA