Fix #873: ThresholdInterval throws StackOverflowException.

[bewshy]

When -ThresholdInterval is used but no metrics data has been collected, Compare-IcingaPluginThresholds returns HasError = $true' but the problem is how that error is handled which causes a loop. This proposed fix now returns a graceful [UNKNOWN]with[Failed to parse metrics over time with -ThresholdInterval "": No data found...]`

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[bewshy]

cla has been signed

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[LordHepipud]

Thank you very much for the PR! I just fixed the code styling by using the correct indents. But I can confirm the issue and the fix.
Could you please update the PR by updating the changelog:

## 1.15.0 (2026-06-30)

[Issues and PRs](https://github.com/Icinga/icinga-powershell-framework/milestone/44)

### Bugfixes

* [#873](https://github.com/Icinga/icinga-powershell-framework/issues/873) Fixes `StackOverflowException` while using `-ThresholdInterval` if no Metrics over Time are present [@bewshy]

I will check with Blerim regarding the cla-bot and once it is completed and the changelog is updated, I will merge the PR. It will be included with the v1.15.0 release von June 30th.

Thank you again for the contribution!!