[Backport 4.8.x] Fix for RestOpenApiProcessor for parsing path variables from the http…

[squakez]

… request uri succesfully. (#16220)

• Update RestOpenApiProcessor.java

if uri is not starting with slash then remove the slash in the consumerPath from the openApi spec, because if there is any path variables (/../{id}) in the consumerPath and the uri does not start with "/" then HttpHelper.evalPlaceholders method throws an ArrayIndexOutOfBoundsException.

• code style fixes and added null check the uri.

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