Move databag parsing after gathering static elements.

[jmsjtu]

During codegen phase when an element is transformed, we gather the databag before processing static elements.

When an element is identified as static safe, we exit the remainder of the transformElement routine which means didn't need to gather the databag at the start.

We should look into processing the databag until after we check is the element is static safe.

This could remove the need for cloning the expression during static content optimization.

Moving the databag processing also causes tes failures with older api versions such as API_VERSION=58