test: fix and unskip block building test "processes txs until hitting timetable"

[dbanks12]

Also fix a later skipped test (can't be unskipped because it is non-deterministic)

[dbanks12]

• test: fix and unskip block building test "processes txs until hitting timetable" #19252 👈 (View in Graphite)
• merge-train/avm

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[AztecBot]

Flakey Tests

🤖 says: This CI run detected 1 tests that failed, but were tolerated due to a .test_patterns.yml entry.

\033FLAKED\033 (\0338;;http://ci.aztec-labs.com/540964e4e8726948�540964e4e87269488;;�\033): yarn-project/scripts/run_test.sh p2p/src/services/tx_provider.test.ts (8s) (code: 1) group:e2e-p2p-epoch-flakes (\033dbanks12\033: test: fix and unskip block building test "processes txs until hitting timetable")