fix: Add timeout-based wait for model deletion completion (#8756)

* fix: Add timeout-based wait for model deletion completion

- Replace simple polling loop with context-based timeout (5 minutes)
- Use select statement for cleaner timeout handling
- Added proper logging for timeout case
- This addresses the code review comment about using context with timeout instead of dangerous polling approach

* Apply suggestion from @mudler

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

* fix: replace goto statements with break in model deletion loop (fixes CI compilation error)

Signed-off-by: LocalAI [bot] <localai-bot@noreply.github.com>

* Apply suggestion from @mudler

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

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Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>
Signed-off-by: LocalAI [bot] <localai-bot@noreply.github.com>
Co-authored-by: localai-bot <localai-bot@users.noreply.github.com>
Co-authored-by: LocalAI [bot] <localai-bot@noreply.github.com>
Co-authored-by: Ettore Di Giacinto <mudler@users.noreply.github.com>