fix: handle illegal state exceptions in TopicMessageQuery subscription

[oGranny]

Description:
improves error handling in the TopicMessageQuery subscription logic, ensuring that cases where the mirror network is not configured or no mirror nodes are available are handled gracefully. It also adds a new integration test to verify this behavior.

Related issue(s):
Fixes #1344

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[github-actions]

Hey @oGranny 👋 thanks for the PR!
I'm your friendly PR Helper Bot 🤖 and I'll be riding shotgun on this one, keeping track of your PR's status to help you get it approved and merged.

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PR Checks

✅ DCO Sign-off -- All commits have valid sign-offs. Nice work!

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✅ GPG Signature -- All commits have verified GPG signatures. Locked and loaded!

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✅ Merge Conflicts -- No merge conflicts detected. Smooth sailing!

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✅ Issue Link -- Linked to #1344 (assigned to you).

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🎉 All checks passed! Your PR is ready for review. Great job!

[rwalworth]

LGTM @oGranny - the fix is clean and the logic is correct. I left one small non-blocking suggestion on the test below. Running workflows and will merge once they pass!

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 4 complexity · 0 duplication

Metric	Results
Complexity	4
Duplication	0

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_{TIP This summary will be updated as you push new changes. Give us feedback}

[oGranny]

Hey @rwalworth, I’ve fixed the linting issues. Let me know if everything looks good.

[rwalworth]

Linting fixes look clean - LGTM! Running the workflows and will merge once they pass!

[github-actions]

👋 Hi @oGranny! Great work on your recent contribution! 🎉

Here are some issues you might want to explore next:

• [Intermediate]: Implement contractInfoQuery in the TCK contract service
• [Intermediate]: Implement contractCallQuery in the TCK contract service
• [Intermediate]: Implement contractByteCodeQuery in the TCK contract service
• [Intermediate]: Implement executeContract in the TCK contract service
• [Intermediate]: Implement updateContract in the TCK contract service

Happy coding! 🚀