bugfix: fix the failure of rollbacking back of the delete SQL at AT m…

[TakeActionNow2019]

• [x] I have registered the PR changes.

Ⅰ. Describe what this PR did

fix the failure of rollbacking back of the delete SQL at AT mode when using SQLServer

Ⅱ. Does this pull request fix one issue?

fix #6449

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

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[TakeActionNow2019]

At AT mode when using SQLServer, if any column of a table is with "IDENTITY", before inserting a value into this column, we should judge whether there is a "IDENTITY" with it or not. Or the database will report errors, ie "Table 'xxx' does not have the identity property. Cannot perform SET operation" and "Cannot insert explicit value for identity column in table 'xxx' when IDENTITY_INSERT is set to OFF."

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 11.11111% with 40 lines in your changes missing coverage. Please review.

Project coverage is 52.38%. Comparing base (7f3b79b) to head (5c41ea6). Report is 1 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...ce/undo/sqlserver/SqlServerUndoDeleteExecutor.java	5.40%	34 Missing and 1 partial :warning:
...che/seata/sqlparser/struct/SqlServerTableMeta.java	0.00%	5 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #6511      +/-   ##
============================================
- Coverage     52.46%   52.38%   -0.09%     
+ Complexity     6387     6385       -2     
============================================
  Files          1080     1081       +1     
  Lines         37576    37617      +41     
  Branches       4457     4462       +5     
============================================
- Hits          19714    19705       -9     
- Misses        15910    15961      +51     
+ Partials       1952     1951       -1     

Files with missing lines	Coverage Δ
...urce/sql/struct/cache/SqlServerTableMetaCache.java	79.09% <100.00%> (+0.38%)	:arrow_up:
...che/seata/sqlparser/struct/SqlServerTableMeta.java	0.00% <0.00%> (ø)
...ce/undo/sqlserver/SqlServerUndoDeleteExecutor.java	28.30% <5.40%> (-61.18%)	:arrow_down:

... and 4 files with indirect coverage changes

[funky-eyes]

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