get more bundler tests passing on windows (#8560)

* get test/bundler/bundler_naming.test.ts passing on windows

* move platformToPosixInPlace to bun.path and use the vector'd version

* only resolve rel_path if it contains '/./', most of the time './' needs to be preserved

* fix another file too

* move kernel32 extern to better location

* [autofix.ci] apply automated fixes

* use bun.path.posixToPlatformInPlace here

* rewrite this whole section to stay in utf16 and handle errors

* remove dead comments

* fix a typo

* undo these relative changes

* preserve path.pretty from getting lost

* use bun's instead of zig's resolve here

* both side of this loop need the inplace normal

* use existing generic dirname function

* make path inplace functions generic

* we might need to modify this so copy on windows

Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>

* don't assume the prefix we get from this

* more robust path traversal

* don't mangle absolute paths

* do this bit in a loop

* this line is a u16

* dont forget to compile before pushing

* this was wrong

* look into this later

* check pointer math first since its faster

* posix syscalls support path traversal, don't do the work for them

* its already inside stable, no need to change

* used the online editor

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>

src/string_immutable.zig

@@ -1726,7 +1726,7 @@ pub const toNTDir = toNTPath;
 
 pub fn toExtendedPathNormalized(wbuf: []u16, utf8: []const u8) [:0]const u16 {
     std.debug.assert(wbuf.len > 4);
-    wbuf[0..4].* = [_]u16{ '\\', '\\', '?', '\\' };
+    wbuf[0..4].* = bun.windows.nt_maxpath_prefix;
     return wbuf[0 .. toWPathNormalized(wbuf[4..], utf8).len + 4 :0];
 }