[Core] Fix inline script length checking

[Michaelvll]

A user reported that the following task yaml fails:

num_nodes: 30

setup: echo setup
run: echo run

This is due to the length checking before does not include the quotes, which will add significant length. We derived the current threshold with binary search.

Tested (run the relevant ones):

• Code formatting: bash format.sh
• Any manual or new tests for this PR (please specify below)
  • reproducible script in [Core] Task fails when run section is to long #3511 with for i in `seq 1 8511`; do echo " echo $i" >> test.yaml; done (not trigger file upload)
  • reproducible script in [Core] Task fails when run section is to long #3511 with for i in `seq 1 8512`; do echo " echo $i" >> test.yaml; done (not trigger file upload)
  • scripts with 30 nodes above.
• All smoke tests: pytest tests/test_smoke.py
• Relevant individual smoke tests: pytest tests/test_smoke.py::test_fill_in_the_name
• Backward compatibility tests: conda deactivate; bash -i tests/backward_compatibility_tests.sh