bugfix: duplicate image row for update join

[renliangyu857]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

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

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[renliangyu857]

这个pr是解决update join的bug，如上图前镜像是根据条件查的，后镜像是根据主键查的，查inner join是笛卡尔积就出现主键一样的数据了。现在是要求前后镜像的行数一样，阻止更新主键，会报前后镜像行数不匹配的错误。
解决方案：通过group by pkNameList区分

[funky-eyes]

LGTM

[codecov-commenter]

Codecov Report

Merging #5004 (6662dd8) into develop (f56b02c) will increase coverage by 0.01%.
The diff coverage is 81.81%.

❗ Current head 6662dd8 differs from pull request most recent head 3828078. Consider uploading reports for the commit 3828078 to get more accurate results

@@              Coverage Diff              @@
##             develop    #5004      +/-   ##
=============================================
+ Coverage      48.81%   48.82%   +0.01%     
  Complexity      4079     4079              
=============================================
  Files            733      733              
  Lines          25951    25962      +11     
  Branches        3199     3201       +2     
=============================================
+ Hits           12669    12677       +8     
- Misses         11933    11936       +3     
  Partials        1349     1349              

Impacted Files	Coverage Δ
...ta/rm/datasource/exec/AbstractDMLBaseExecutor.java	57.14% <ø> (ø)
...datasource/exec/mysql/MySQLUpdateJoinExecutor.java	86.08% <81.81%> (-0.46%)	⬇️
...erver/storage/file/session/FileSessionManager.java	47.77% <0.00%> (-0.64%)	⬇️
...er/src/main/java/io/seata/server/ServerRunner.java	50.00% <0.00%> (ø)

[funky-eyes]

按照 http://dev.cs.ovgu.de/db/sybase9/help/dbugen9/00000284.htm 规范来说，groupby pk是不符合规范的，但是groupby所有查询列的做法可能在前镜像查询的时候造成负担（前镜像的where条件不一定命中索引）
月会将进行如下讨论，抉择一个方案落实
优先1,如果能查到mode是什么,1,2都做,mode作为选择开关
1.保持当前pr group by pk做法
2.groupby 查询列
3.代码层面去重 不推荐,可以做到list的去重

[slievrly]

LGTM

[luky116]

seata-go: apache/incubator-seata-go#703