optimize: skip check lock when all the before image is empty

[caohdgege]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

fixes #4236

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #4237 (3c4fc60) into develop (b03abc8) will decrease coverage by 0.02%.
The diff coverage is 54.63%.

@@              Coverage Diff              @@
##             develop    #4237      +/-   ##
=============================================
- Coverage      48.87%   48.85%   -0.03%     
  Complexity      3799     3799              
=============================================
  Files            724      724              
  Lines          24203    24218      +15     
  Branches        2957     2965       +8     
=============================================
+ Hits           11829    11831       +2     
- Misses         11150    11155       +5     
- Partials        1224     1232       +8     

Impacted Files	Coverage Δ
...ommon/src/main/java/io/seata/common/Constants.java	100.00% <ø> (ø)
...rc/main/java/io/seata/core/lock/LocalDBLocker.java	0.00% <ø> (ø)
...n/java/io/seata/rm/datasource/ConnectionProxy.java	25.00% <ø> (ø)
...ver/storage/db/lock/DataBaseDistributedLocker.java	0.86% <ø> (ø)
.../io/seata/server/storage/file/lock/FileLocker.java	79.12% <0.00%> (ø)
...java/io/seata/rm/datasource/ConnectionContext.java	74.35% <18.18%> (-6.02%)	⬇️
...o/seata/server/storage/redis/lock/RedisLocker.java	39.48% <33.33%> (-0.21%)	⬇️
...in/java/io/seata/server/transaction/at/ATCore.java	44.11% <40.00%> (+0.78%)	⬆️
...o/seata/server/storage/db/lock/DataBaseLocker.java	14.58% <50.00%> (ø)
...a/server/storage/db/lock/LockStoreDataBaseDAO.java	52.09% <80.48%> (-0.47%)	⬇️
... and 2 more

[funky-eyes]

LGTM

[slievrly]

LGTM