bugfix: fix postgresql sql script index name conflicts

[gao1143632516]

In the same mode, in order to avoid the conflict of different table index names, it is best to spell the table name in the index name

• I have registered the PR changes.

Ⅰ. Describe what this PR did

fix the postgresql.sql index name conflicts

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.43%. Comparing base (a866c2d) to head (6cf132b).

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #6372      +/-   ##
============================================
+ Coverage     52.40%   52.43%   +0.02%     
+ Complexity     5245     5243       -2     
============================================
  Files           924      924              
  Lines         32066    32066              
  Branches       3833     3833              
============================================
+ Hits          16805    16813       +8     
+ Misses        13608    13596      -12     
- Partials       1653     1657       +4     

see 5 files with indirect coverage changes

[slievrly]

LGTM

Pls add change:
https://github.com/apache/incubator-seata/blob/2.x/changes/zh-cn/2.x.md
https://github.com/apache/incubator-seata/blob/2.x/changes/en-us/2.x.md

[leizhiyuan]

@gao1143632516 need to solve conflict

[slievrly]

@gao1143632516 thanks for you contributions.