ci: stabilize Windows test-cost ratchet

[matdev83]

Changes

• allow the observed two-process variance in the short quality-check measurement
• give the complete three-target Windows ratchet 30 minutes instead of timing out during the final head measurement

Evidence

• repeated main run completed test-unit comparison successfully
• quality-checks used 29 processes vs an allowed 27; this raises only the additive tolerance from 6 to 8
• the same run reached qa-tagged-hotspots head measurement at the former 20-minute deadline
• go test -count=1 ./tools/testcost ./tools/taskrunner
• authorized ratchet preflight passed with LIP_ALLOW_TEST_COST_GROWTH=1

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