refactor(rollup-relayer): tweak finalize batch logs

[colinlyguo]

Purpose or design rationale of this PR

The logs are confusing now, make it more clear.

PR title

Your PR title must follow conventional commits (as we are doing squash merge for each PR), so it must start with one of the following types:

• refactor: A code change that doesn't fix a bug, or add a feature, or improves performance

Deployment tag versioning

Has tag in common/version.go been updated or have you added bump-version label to this PR?

• Yes

Breaking change label

Does this PR have the breaking-change label?

• No, this PR is not a breaking change

[codecov]

Codecov Report

Merging #1009 (50744d3) into develop (0243c86) will decrease coverage by 0.01%.
The diff coverage is 33.33%.

❗ Current head 50744d3 differs from pull request most recent head 56838e3. Consider uploading reports for the commit 56838e3 to get more accurate results

@@             Coverage Diff             @@
##           develop    #1009      +/-   ##
===========================================
- Coverage    48.01%   48.00%   -0.01%     
===========================================
  Files          101      101              
  Lines        10669    10671       +2     
===========================================
  Hits          5123     5123              
- Misses        5118     5120       +2     
  Partials       428      428              

Flag	Coverage Δ
rollup	66.02% <33.33%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
rollup/internal/controller/relayer/l2_relayer.go	41.57% <33.33%> (-0.16%)	⬇️