CI: verify full source code

[sept-en]

Our bridge contracts use some dependencies (i.e. near-sdk-rs) which provide some useful tools like macros, attributes, etc. Some of these dependencies may be occasionally updated to the other version. In order, to ensure there's no breaking stuff happening, we should be also tracking the expanded version (e.g. using cargo expand) to ensure the security and compatibility of the contracts (nothing suspicious is added, and no data migration is implicitly required, etc).