fix: migrate legacy Sedna API calls to standard inference methods in lifelong learning

[Fahmid-Arman]

What type of PR is this?
/kind bug

What this PR does / why we need it:
The lifelong learning paradigm controller previously called job.my_inference() and job.inference_2(), which are internal Sedna fork methods absent from the public Sedna 0.6.0.1 API. These raised AttributeErrors that blocked test inference from executing.

• Replaced the deprecated job.my_inference() and job.inference_2() calls with the standard job.inference() method.
• Aligned the core Ianvs framework with the public Sedna LifelongLearning API contract.
• Unblocked the final test inference step for all lifelong learning examples running in no-inference and hard-example mining modes.

Which issue(s) this PR fixes:
Fixes #461

[kubeedge-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Fahmid-Arman
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[gemini-code-assist]

Code Review

This pull request updates the lifelong learning algorithm to use the standard inference method instead of custom variants. The review feedback correctly identifies that job.inference returns a 3-tuple, and assigning it directly to test_res will cause a type mismatch downstream; it suggests unpacking the tuple to only assign the first element.

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[Fahmid-Arman]

/assign @MooreZheng