kdump: avoid false negatives from fixed 100s stall window

[lubaihua33]

What
This PR replaces the fixed ~100s stall threshold in kdump result checking with adaptive windows derived from imeout_of_dump_crash.

Why
On large-memory VMs, vmcore write can pause/grow slowly and exceed a fixed 100s no-growth check, causing false failures (e.g., vmcore-incomplete).

Changes
Replace fixed max_tries = 20 with dynamic windows:

• no-file window: max(100, min(timeout/4, 300))
• no-growth window: max(100, min(timeout/3, 600))
• Convert windows into retry counts with 5s polling interval.
• Include effective wait duration in failure messages for diagnostics.

[github-actions]

✅ AI Test Selection — PASSED

1 test case(s) selected (view run)

Marketplace image: canonical 0001-com-ubuntu-server-jammy 22_04-lts-gen2 latest

	Count
✅ Passed	0
❌ Failed	0
⏭️ Skipped	1
Total	1

Test case details

Test Case	Status	Time (s)	Message
verify_mshv_crash (lisa_0_0)	⏭️ SKIPPED	0.000	check skipped: OS type mismatch: ["requires [<class 'lisa.operating_system.CBLMariner'>] but VM supports [<class 'lisa.o

[Copilot]

Pull request overview

This PR updates the kdump vmcore result-check loop to avoid false failures caused by a fixed ~100s “no growth / no file” stall threshold, by deriving adaptive wait windows from timeout_of_dump_crash and improving failure diagnostics.

Changes:

• Replaces the fixed max_tries = 20 (≈100s at 5s polling) with adaptive “no file” and “no growth” windows derived from timeout_of_dump_crash.
• Converts these windows into retry counts (via math.ceil) and surfaces the chosen wait window in raised exceptions.

[github-actions]

✅ AI Test Selection — PASSED

1 test case(s) selected (view run)

Marketplace image: canonical 0001-com-ubuntu-server-jammy 22_04-lts-gen2 latest

	Count
✅ Passed	0
❌ Failed	0
⏭️ Skipped	1
Total	1

Test case details

Test Case	Status	Time (s)	Message
verify_mshv_crash (lisa_0_0)	⏭️ SKIPPED	0.000	check skipped: OS type mismatch: ["requires [<class 'lisa.operating_system.CBLMariner'>] but VM supports [<class 'lisa.o