fix: resolve quiesceAndThenRestartMixedOps() flakiness

[AlexKehayov]

Description:
Follow-up to #24404.

Root Cause:
The original test's log assertion (assertHgcaaLogContains) searched the entire log file and trivially matched a transient startup quiescence event from node boot. It never validated that real sustained quiescence occurred during the test. The rare CI flake was the balance assertion failing due to tight timing margins.

Findings:

• Transient vs real quiescence: The network produces ~5-6 quiescence transitions per run. All but one are transient (<1ms between "Started" and "Stopping"). The real one lasts ~22s - the heartbeat runs until it finds the TCT near the scheduled tx expiry.
• Staking period transactions prevent quiescence: With staking.periodMins=1 (test default), staking transactions fire every 60s of consensus time, keeping the network active. Suppressing them is required for reliable quiescence.
• overridingAllOf doesn't survive restart: It updates system file 0.0.121 in state, but env overrides set via restartAtNextConfigVersion(envOverrides) are set as process environment variables that take effect at startup - before the system file is processed.

Changes:

• LogContainmentPairTimeframeOp.java (new) - Generic UtilOp that finds two log patterns in order within a timeframe, with a time gap in [minGap, maxGap]. Distinguishes real state transitions from transient flickers.
• UtilVerbs.java - Added assertHgcaaLogContainsPairTimeframe() verb.
• LifecycleTest.java - Added restartAtNextConfigVersion(Map<String, String> envOverrides) overload that passes env overrides through to the subprocess nodes.
• QuiesceThenMixedOpsRestartTest.java - Uses restartAtNextConfigVersion with env overrides to suppress staking transactions. Replaced single-pattern log assertion with paired assertion (minGap=5s, maxGap=40s) that deterministically matches only the real sustained quiescence.

Fixes #24398

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[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

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[gkozyryatskyy]

LGTM! Thank you @AlexKehayov !

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@             Coverage Diff              @@
##               main   #24567      +/-   ##
============================================
+ Coverage     78.23%   78.29%   +0.06%     
+ Complexity    11692    11688       -4     
============================================
  Files          2490     2486       -4     
  Lines         95107    94900     -207     
  Branches      10293    10280      -13     
============================================
- Hits          74406    74305     -101     
+ Misses        16960    16855     -105     
+ Partials       3741     3740       -1     

see 19 files with indirect coverage changes

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[github-actions]

Node: HAPI Test (Misc) Results

  160 files  ±0      3 errors  157 suites  ±0   1h 16m 46s ⏱️ - 16m 18s
  170 tests ±0    168 ✅ ±0  2 💤 ±0  0 ❌ ±0 
1 222 runs  ±0  1 220 ✅ ±0  2 💤 ±0  0 ❌ ±0 

For more details on these parsing errors, see this check.

Results for commit 797302a. ± Comparison against base commit bc67352.

♻️ This comment has been updated with latest results.

[codacy-production]

Not up to standards ⛔

🟢 Coverage ∅ diff coverage · 0.00% coverage variation

Metric	Results
Coverage variation	✅ 0.00% coverage variation (-1.00%)
Diff coverage	✅ ∅ diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (3d9574f)	94803	77996	82.27%
Head commit (583cd04)	94803 (+0)	77994 (-2)	82.27% (0.00%)

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 (#24567)	0	0	∅ (not applicable)

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%

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[github-actions]

⚠️ New Flaky Test(s) Detected — Action Required

New flaky tests were detected in this run. New tickets have been created and require your attention — please investigate whether the flakiness was introduced by changes in this PR.

Test	Ticket
com.hedera.services.bdd.suites.integration.BlockNodeRewardsTests#activeNodeWithOneRegisteredBlockNodeGetsConsensusAndBlockReward	#24711 (🆕 New)

Please review the linked tickets and determine if any of the new issues were caused by your changes.