Improve ProcessManager.Win (#32010)

Improve ProcessManager.Win (#32010)

* ---- Style changes start here ----

* Remove unnecessary using directives

* Remove unnecessary assignments

* Use IntPtr.Zero

* Replace magic numbers

* Remove unused parameters

* Replace constructor with initializer

* Simplify delegate interop

* Inline temporary variables

* Remove unnecessary checked keyword

* Remove unnecessary cast

* Introduce using statement

* ---- Style changes end here ----

* Remove magic sleep

* Prealloc list

* Reduce copying

* Use ArrayPool

* Support long path

* Improve P/Invoke signatures

* Optimize modules enumeration

* Rename and move HandleLastWin32Error

* while (true)

* Move comments near codes

* Revert "Support long path"

This reverts commit 1f06435144925668e7273ec458e78b869aad6055.

* Revert "Introduce using statement"

This reverts commit e3d383a229c13b096dbdef9aa9c857ee6cf986e1.

* Revert "Remove magic sleep"

This reverts commit d8bc0017131a9d9d6c1f66569a87699f9f7faea6.

* Add braces

* Simplify initialization

* Fix last Win32 error

* Avoid reallocation if modules count decreased

* Nits

* Simplify codes