bugfix: when mixed use of AT and TCC, AT branchs is not deleted

[wangliang181230]

Ⅰ. Describe what this PR did

bugfix: when mixed use of AT and TCC, AT branchs is not deleted.
问题修复：AT和TCC混合使用时，AT分支未被及时删除。

顺便优化一下：

顺便添加上一个PR中变更过配置位置的提示，效果如下图：

Ⅱ. Does this pull request fix one issue?

fixes #3295

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

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #3296 (8fcd659) into develop (15f0d6e) will decrease coverage by 0.11%.
The diff coverage is 0.00%.

@@              Coverage Diff              @@
##             develop    #3296      +/-   ##
=============================================
- Coverage      51.12%   51.00%   -0.12%     
- Complexity      3295     3297       +2     
=============================================
  Files            614      614              
  Lines          20125    20099      -26     
  Branches        2514     2467      -47     
=============================================
- Hits           10288    10251      -37     
+ Misses          8805     8796       -9     
- Partials        1032     1052      +20     

Impacted Files	Coverage Δ	Complexity Δ
.../java/io/seata/server/coordinator/DefaultCore.java	47.56% <0.00%> (-1.83%)	24.00 <0.00> (+1.00)	⬇️
...obuf/convertor/BranchRegisterRequestConvertor.java	90.47% <0.00%> (-9.53%)	3.00% <0.00%> (ø%)
...otobuf/convertor/BranchReportRequestConvertor.java	90.90% <0.00%> (-9.10%)	3.00% <0.00%> (ø%)
...obuf/convertor/BranchRollbackRequestConvertor.java	92.00% <0.00%> (-8.00%)	3.00% <0.00%> (ø%)
...otobuf/convertor/GlobalBeginResponseConvertor.java	92.59% <0.00%> (-7.41%)	3.00% <0.00%> (ø%)
...otobuf/convertor/GlobalCommitRequestConvertor.java	93.75% <0.00%> (-6.25%)	3.00% <0.00%> (ø%)
...otobuf/convertor/GlobalStatusRequestConvertor.java	93.75% <0.00%> (-6.25%)	3.00% <0.00%> (ø%)
...obuf/convertor/GlobalRollbackRequestConvertor.java	93.75% <0.00%> (-6.25%)	3.00% <0.00%> (ø%)
...protobuf/convertor/RegisterTMRequestConvertor.java	94.73% <0.00%> (-5.27%)	3.00% <0.00%> (ø%)
...protobuf/convertor/RegisterRMRequestConvertor.java	90.47% <0.00%> (-4.77%)	3.00% <0.00%> (ø%)
... and 27 more

[caohdgege]

LGMT

[funky-eyes]

LGTM

[jsbxyyx]

LGTM