fix: bypass Sedna network timeouts during local offline benchmarking

[karyxx]

What type of PR is this?
/kind bug
/kind feature

What this PR does / why we need it:
This PR introduces a global network bypass patch for the Sedna client inside benchmarking.py and core/cmd/benchmarking.py.

Why is it needed?

When running Ianvs benchmarks locally, there is no active KubeEdge Cloud controller or Knowledge Base server. Despite this, the Sedna backend client attempts REST calls to remote/null endpoints. Because it is decorated with tenacity retry logic, it retries failed attempts up to 5 times with 3-second waits (15 seconds total per call).

Across multiple incremental seen/unseen training and evaluation rounds, these network timeouts block execution, wasting up to 15–20 minutes of idle wait time per benchmarking job.

What does this patch do?

1. Intercepts the module-level sedna.service.client.http_request function at the Ianvs entry points.
2. Checks if the destination endpoint is local/null (None/, 127.0.0.1, localhost).
3. If it is local and the toggle is enabled, it instantly raises a ConnectionError("Connection refused.") to bypass the 15-second retry loops. This allows Sedna's internal try/except blocks to run and gracefully fall back to local offline mechanisms without any delay.
4. Provides a toggle BYPASS_TIMEOUTS (default: "1" / enabled). If set to "0", the bypass is disabled.

How to test it?

To run benchmarks normally with the bypass enabled:

ianvs -f examples/robot/lifelong_learning_bench/semantic-segmentation/benchmarkingjob-simple.yaml

To run benchmarks with the bypass disabled (original timeout behavior):

BYPASS_TIMEOUTS=0 ianvs -f examples/robot/lifelong_learning_bench/semantic-segmentation/benchmarkingjob-simple.yaml

Fixes #494

[kubeedge-bot]

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This pull-request has been approved by: karyxx
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[kubeedge-bot]

Welcome @karyxx! It looks like this is your first PR to kubeedge/ianvs 🎉

[gemini-code-assist]

Code Review

This pull request introduces a mechanism to bypass local or invalid HTTP endpoints to speed up offline runs by patching Sedna's HTTP request client. However, this patching logic is duplicated across benchmarking.py and core/cmd/benchmarking.py. Feedback recommends extracting this logic into a shared helper function in core/common/utils.py to adhere to DRY principles. Additionally, the current implementation logs that the bypass is active even when it is disabled, and it incurs unnecessary performance overhead by querying the environment variable on every single HTTP request.

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[karyxx]

I have moved the logic inside core/common/utils.py, resolved the performance overhead and misleading log message.