CAMEL-23209: Fix flaky SMB tests

[gnodet]

Summary

• Increase Awaitility timeouts from 3-6s to 15s across all SMB integration tests to prevent race conditions in CI
• Add initialDelay=3000 to SmbComponentConnectionIT consumer routes to prevent the consumer from polling before producer writes complete (fixes expected: <Good Bye> but was: <>)
• Fix NPE in SmbServerTestSupport.copyFileContentFromContainer when the file hasn't been moved yet — now throws AssertionError instead of returning null, which Awaitility properly catches and retries

Test plan

• All 29 modified test files compile
• CI runs SMB integration tests without flaky failures

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• components/camel-smb

Full reactor (72 modules)

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