Refactor e2e_verify_common_*

[ianlewis]

We should remove e2e_verify_common_all and replace with e2e_verify_common_all_v02. We may still need to make a distinction between BYOB and non-BYOB builders but we should rename these functions to something more descriptive like e2e_verify_common_all_v02 and e2e_verify_common_all_byob_v02 etc.

Right now I believe it is:

• e2e_verify_common_all -> non-BYOB SLSA v0.2 builders/generators
• e2e_verify_common_all_v02 -> BYOB SLSA v0.2 builders (e.g. Node.js builder)