Prevent fork bomb when defining the experimental process_isolation option globally in the init_config section

[fanny-jiang]

What does this PR do?

Fixes fork bomb and CPU overconsumption when using process_isolation: true in the init_config.

Motivation

QA #12986

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached
• If the PR doesn't need to be tested during QA, please add a qa/skip-qa label.

[codecov]

Codecov Report

Merging #13091 (0ea0e19) into master (87a8419) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

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