refactor(minifier): remove old code for folding expressions to throw/return (#25974)

drop dead code related to folding expressions to throw/return as is no
longer can be executed

this code is no longer executed and its a duplication of
`handle_throw_statement` and `handle_return_statement`

we process all stmts first, and after that we try to process them again,
even if everything should be join't already, beside normal check, i'v
tried to execute this code on bunch of codebases / all tests cases and
its truly dead, we may want to move logic used for IF's also to
`handle_return_statement` and `handle_throw_statement`

originally this was added before handle_throw_statement and
handle_return_statement was a thing and its part of initial setup


https://github.com/oxc-project/oxc/blob/b016fd41101de5038a77484c11c0a19c1aa965a9/crates/oxc_minifier/src/peephole/minimize_statements.rs#L947-L956


https://github.com/oxc-project/oxc/blob/b016fd41101de5038a77484c11c0a19c1aa965a9/crates/oxc_minifier/src/peephole/minimize_statements.rs#L972-L981