[Bug][move-compiler-v2] v2 missed some mutable borrow errors

[brmataptos]

🐛 Bug

V1 and V2 outputs for these tests differ significantly:

• third_party/move/move-compiler/tests/move_check/typing/mutable_borrow_from_immutable.exp
• third_party/move/move-compiler-v2/tests/reference-safety/v1-typing/mutable_borrow_from_immutable.exp

In particular, V2 is missing errors at lines 11, 15, 16.

Splitting the test into multiple functions (as part of PR #14578) reveals the error at line 11 to V2, but the ones at 15 & 16 are still missing (now would be at line 24 & 25):

• third_party/move/move-compiler/tests/move_check/typing/mutable_borrow_from_immutable2.exp
• third_party/move/move-compiler-v2/tests/reference-safety/v1-typing/mutable_borrow_from_immutable2.exp

[github-actions]

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[wrwg]

Need to verify whether it is just error shadowing