fix(gas-oracle): fetch base fee from the latest L1 block

[colinlyguo]

Purpose or design rationale of this PR

Previously, the gas oracle sender utilized the base fee of the most recently finalized block to update the L2 gas oracle's recommended L1 gas price. This method caused a delay of at least 12.8 minutes, which is equivalent to 2 epochs.

In this PR, we have optimized the process to reduce this delay.

Key Changes:

1. The L1 watcher now extracts the base fee from the most recent L1 block.
2. When reorgs, soft-delete the outdated block and insert the new one.

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:

• fix: A bug fix

Deployment tag versioning

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

• No, this PR doesn't involve a new deployment, git tag, docker image tag
• Yes

Breaking change label

Does this PR have the breaking-change label?

• No, this PR is not a breaking change
• Yes

[codecov]

Codecov Report

Merging #920 (1813fec) into develop (f4663fd) will increase coverage by 0.35%.
The diff coverage is 57.14%.

❗ Current head 1813fec differs from pull request most recent head 6a442e2. Consider uploading reports for the commit 6a442e2 to get more accurate results

@@             Coverage Diff             @@
##           develop     #920      +/-   ##
===========================================
+ Coverage    49.23%   49.59%   +0.35%     
===========================================
  Files           95       95              
  Lines         9899     9906       +7     
===========================================
+ Hits          4874     4913      +39     
+ Misses        4619     4580      -39     
- Partials       406      413       +7     

Flag	Coverage Δ
rollup	63.34% <57.14%> (+1.14%)	⬆️

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

Files Changed	Coverage Δ
rollup/internal/orm/l1_block.go	65.00% <57.14%> (+65.00%)	⬆️