Clean redundant codes of Springcloud XA

[fjz99]

Make sure that:

• [x] You have read the contribution guidelines.
• [x] You submit test cases (unit or integration tests) that back your changes.
• [x] Your local test passed mvn clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Merging #338 (a9118fe) into master (eabee8b) will not change coverage. The diff coverage is 0.00%.

@@          Coverage Diff           @@
##           master    #338   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files         436     435    -1     
  Lines        8399    8412   +13     
  Branches     1373    1377    +4     
======================================
- Misses       8399    8412   +13     

Impacted Files	Coverage Δ
...omara/hmily/xa/core/HmilyXaTransactionManager.java	0.00% <0.00%> (ø)
...ava/org/dromara/hmily/xa/core/TransactionImpl.java	0.00% <0.00%> (ø)
.../dromara/hmily/xa/core/TransactionManagerImpl.java	0.00% <0.00%> (ø)
...java/org/dromara/hmily/xa/core/XaResourcePool.java	0.00% <0.00%> (ø)
...xa/rpc/spring/RollbackHmilyTransactionHandler.java	0.00% <0.00%> (ø)

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