Remove GST test chaining from driver.md

[anvacaru]

Refactor the semantics of driver.md and remove the rules associated with chaining multiple tests.

• Simplified run rules to process a single test entry instead of chaining multiple entries
• Removed failure String syntax and associated rules; since only one test is executed at a time and the test harness manages test names externally, this is no longer needed
• Removed TESTID propagation from run, process, and check commands
• Removed unused output-success-java.json file
• Updated output-success-{haskell,llvm}.json files.

[ehildenb]

Did you confirm that breaking a vmtest and a bchaintest manually and the test-harness correctly finds the breakage?

[anvacaru]

Did you confirm that breaking a vmtest and a bchaintest manually and the test-harness correctly finds the breakage?

Yes, I modified the gasUsed blockheader value in VMTests/vmArithmeticTest/add.json and they fail as expected.

[1] anvacaru@desktop kevm-pyk$ uv run -- pytest src/tests/integration --verbose --durations=0 --dist=worksteal --maxfail=3 --numprocesses=2 -k 'test_conformance.py and (15_tstoreCannotBeDosd.json or add.json)
=================================================================================== test session starts ===================================================================================
src/tests/integration/test_conformance.py::test_bchain[stZeroKnowledge/pointAdd.json]
src/tests/integration/test_conformance.py::test_vm[vmArithmeticTest/add.json]
[gw0] [ 25%] FAILED src/tests/integration/test_conformance.py::test_vm[vmArithmeticTest/add.json]
src/tests/integration/test_conformance.py::test_bchain[stZeroKnowledge/pointMulAdd.json]
[gw1] [ 50%] PASSED src/tests/integration/test_conformance.py::test_bchain[stZeroKnowledge/pointAdd.json]
src/tests/integration/test_conformance.py::test_bchain[Cancun/stEIP1153-transientStorage/15_tstoreCannotBeDosd.json]
[gw0] [ 75%] PASSED src/tests/integration/test_conformance.py::test_bchain[stZeroKnowledge/pointMulAdd.json]
[gw1] [100%] FAILED src/tests/integration/test_conformance.py::test_bchain[Cancun/stEIP1153-transientStorage/15_tstoreCannotBeDosd.json]