Silently fail when srv query fail

[zhiyuanliang-ms]

Why this PR?

• Fix the potential memory leak issue introduced by Promise.race.

• If srv query failed or timed out, it should not fail the whole provider, instead, it should be a silent error.

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[Copilot]

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Comments suppressed due to low confidence (1)

src/ConfigurationClientManager.ts:152

• Ensure that the new behavior of swallowing errors in #discoverFallbackClients is covered by tests.

console.warn(`Failed to build fallback clients, ${error.message}`);