docs(profiler): clarify when planner-profile-data ConfigMap is emitted [DYN-2751] (cherry-pick of #8486)

[tedzhouhk]

Summary

Cherry-pick of #8486 to release/1.1.0, with the docstring / TODO text adjusted for the release branch's actual behavior (rapid mode on release/1.1.0 still writes NPZ to disk — the main branch's AIC-in-planner deferral doesn't exist here yet).

Changes vs. the main PR:

• Dropped the build_aic_interpolation_spec function addition entirely — it was introduced on main by feat(planner): own AIC interpolation; fix MoE-DEP bugs in rapid mode #8335 and has no home on release/1.1.0.
• Dropped the "vLLM self-benchmark (DYN_BENCHMARK_MODE)" and "rapid mode defers to planner" language from the assemble_final_config docstring — neither exists on release/1.1.0.
• Reworded the profile_sla.py TODO: on release, the gap is that run_interpolation skips agg picks entirely (no NPZ → no planner-profile-data-XXXX ConfigMap → planner/mocker have nothing to consume for agg deployments).

Net effect: documents the actual release/1.1.0 behavior observed in DYN-2751 and flags the agg + profiling-data gap with a TODO. No behavior change.

Test plan

• pre-commit run on the two touched files passes.
• Lint-only PR — no runtime change, no tests added.

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