[cherry-pick][release-v0.17] fix(llmisvc): remove ibm-aiu-setup.sh sourcing from base template (#1200)

[KillianGolds]

Body

Cherry-pick of #1200

What this PR does / why we need it

Removes the ibm-aiu-setup.sh conditional sourcing from the base llmisvc template. This logic belongs in the accelerator-specific Spyre configs, not the base template. Already merged on midstream master.

Conflicts resolved

None, clean cherry-pick.

Dependencies

Must be merged before the cherry-pick of kserve#5154 (feat(llmisvc): add --disable-uvicorn-access-log to vllm configs), which is rebased on top of this change.

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