Finalization script fixes.

- actually do the first step instead of just logging a message,
- make sure extension SDK bump gets picked up by the topic,
- fix the resources_sdk_int in first step, and unfix in the second.

Bug: 278246368
Fixes: 278246368
Test: local run
Change-Id: I0d0f4e2ec7f0b584b9fc14a545cfec73a9fcbdea