CG-10465 raw text edit

[tkfoss]

Motivation

File(name="doc.mdx").edit(...) and .replace(...) should edit in place. Right now it's appending.

Content

New File methods.

Testing

UT, manual testing.

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[linear]

CG-10465 `File(name="doc.mdx").edit(...)` and `.replace(...)`

This should instead edit in place

See failing unit test:

pytest.mark.skip("MDX editing is broken")
def test_codebase_edit_mdx(tmpdir) -> None:
    """Editing MDx seems broken currently - it will just prepend to the file"""
    with get_codebase_session(tmpdir=tmpdir, files={"file1.mdx": "# Header", "file2.tsx": "console.log('hello, world!')"}) as codebase:
        file = codebase.get_file("file1.mdx")
        file.edit("NEW TEXT")
        codebase.commit()
        file = codebase.get_file("file1.mdx")
        assert file.content == "NEW TEXT" # FAILS HERE

See both tests here: https://github.com/codegen-sh/codegen-sdk/pull/61/files#diff-4c59eb8de2ddb0302e1e182485d837998ede3bdcad2cb47f79f25f2dbac8aaf0

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