Fix dying worker during file extraction

[Floppy]

If the worker process dies during uploaded file processing, for whatever reason, the resulting model is left in a bad state. The job will not be marked as completed, so it's often retried, but leaves half a model lying around.

Need to solve this by a combination of:

• Improving memory efficiency of file extraction, to avoid the OOM reaper which might be what's killing it.
• Make the job resumable somehow

Should help resolve #6293

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics -4 complexity

Metric	Results
Complexity	-4

View in Codacy

🟢 Coverage 100.00% diff coverage · +0.02% coverage variation

Metric	Results
Coverage variation	✅ +0.02% coverage variation (-1.00%)
Diff coverage	✅ 100.00% diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a0e959f)	7421	6210	83.68%
Head commit (fbc331e)	7430 (+9)	6219 (+9)	83.70% (+0.02%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6462)	9	9	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

_{NEW Get contextual insights on your PRs based on Codacy's metrics, along with PR and Jira context, without leaving GitHub. Enable AI reviewer
TIP This summary will be updated as you push new changes.}