Refactor signing/assemble code in openjdk_build_pipeline.groovy to su…

…pport Windows/docker builds (#1117)

* First pass of batOrSh and fixes for windows containers

Signed-off-by: Stewart X Addison <[email protected]>

* Refactoring signing code to allow operation in Windows containers

Signed-off-by: Stewart X Addison <[email protected]>
* Reduce stashing and avoid pre-unstash chmod in non-docker case

Signed-off-by: Stewart X Addison <[email protected]>

* Move workspace scope and use it for cleaning cyclone-dx and security directories

Signed-off-by: Stewart X Addison <[email protected]>

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Signed-off-by: Stewart X Addison <[email protected]>
Signed-off-by: Andrew Leonard <[email protected]>
Co-authored-by: Andrew Leonard <[email protected]>
Co-authored-by: sophia-guo <[email protected]>
Co-authored-by: George Adams <[email protected]>