chore(ci): migrate amd64 runners to gha-lfdt-lineth-ss scale sets

[eloi010]

Renames all amd64 self-hosted runners from gha-runner-scale-set-ubuntu-24-amd64-* to gha-lfdt-lineth-ss-ubuntu-24-amd64-* across the workflows.

• Pure prefix rename; size suffixes (small/med/large/xl/xxl) unchanged.
• 85 files, 117 runs-on: values updated.
• The single arm64 runner in prover-native-lib-blob-compressor-release.yml is left unchanged (no arm64 variant in the new naming).

Also fixes the zkc native keccak benchmark: go-corset moved to github.com/LFDT-Lineth/zkc. The remote go install now tries the new module path first and falls back to the old one, so refs on either side of the rename (base=main vs. pinned pre-rename opt commit) resolve.

Also fixes prover compressor tests after the linea-monorepo → lineth-monorepo directory rename: GetRepoRootPath matched the hardcoded linea-monorepo string in the working-dir path ("could not find repo root"). It now walks up to the .git marker, independent of the checkout dir name.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
1151	1	1150	1

View the full list of 1 ❄️ flaky test(s)

maru.app.MaruConsensusSwitchTest::follower node correctly switches from QBFT to POS after peering with Sequencer validator()

Flake rate in main: 63.64% (Passed 4 times, Failed 7 times)

Stack Traces | 191s run time

java.lang.AssertionError: invalid block time: expected=1 actual=2 blocks timestamps=[1780684850, 1780684851, 1780684852, 1780684853, 1780684854, 1780684855, 1780684856, 1780684857, 1780684858, 1780684859, 1780684860, 1780684861, 1780684862, 1780684863, 1780684864, 1780684865, 1780684866, 1780684867, 1780684868, 1780684869, 1780684870, 1780684871, 1780684873, 1780684875, 1780684877, 1780684880, 1780684882, 1780684884, 1780684887, 1780684890, 1780684892, 1780684894, 1780684896, 1780684898, 1780684899, 1780684900, 1780684901, 1780684902, 1780684903, 1780684904, 1780684905, 1780684906, 1780684907, 1780684908, 1780684909, 1780684910, 1780684911, 1780684912, 1780684913, 1780684914, 1780684915, 1780684916, 1780684917, 1780684918, 1780684919, 1780684920, 1780684921, 1780684922, 1780684923, 1780684924, 1780684925, 1780684926, 1780684927, 1780684928, 1780684929, 1780684930, 1780684931, 1780684932]
	at testutils.Checks.verifyBlockTime(Checks.kt:129)
	at maru.app.MaruConsensusSwitchTest.verifyConsensusSwitch(MaruConsensusSwitchTest.kt:95)
	at maru.app.MaruConsensusSwitchTest.follower node correctly switches from QBFT to POS after peering with Sequencer validator(MaruConsensusSwitchTest.kt:187)
	at java.base/java.lang.reflect.Method.invoke(Method.java:565)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:511)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1450)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2019)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)

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