Implement Iterator.prototype.find method

[2Jaeheon]

This pull request introduces the implementation of the Iterator.prototype.find method, aligning with the TC39 Iterator Helpers proposal. Key changes include the addition of the find method to the iterator prototype, its integration into the global object, and updates to the test suite to reflect the new functionality.

Implementation of Iterator.prototype.find:

• Addition of builtinIteratorFind method: Implemented the logic for Iterator.prototype.find, including validation of the this value and the predicate argument, iteration over the iterator, and handling of abrupt completions. (src/builtins/BuiltinIterator.cpp, src/builtins/BuiltinIterator.cppR191-R245)

• Integration into the iterator prototype: Registered the find method on the m_iteratorPrototype object with proper property attributes (writable and configurable). (src/builtins/BuiltinIterator.cpp, src/builtins/BuiltinIterator.cppR320-R322)

Test suite updates:

• Removal of Iterator.prototype.find tests from exclusion list: Marked several Iterator.prototype.find tests as no longer excluded, indicating the feature is now implemented and ready for testing. (tools/test/test262/excludelist.orig.xml, tools/test/test262/excludelist.orig.xmlL505-L529)

[clover2123]

Please rebase this patch again 🥲
FYI) clang-format is updated to 20 version, not 18

[2Jaeheon]

I checked the history with git reflog and rolled back to a point before multiple clang-related changes were introduced. After that, I rebased and resolved the issue accordingly!

[ksh8281]

Nice Job!