optimize: once delete GlobalSession locks for db mode when commit success

[zjinlei]

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

[codecov-io]

Codecov Report

Merging #1574 into develop will increase coverage by 0.02%.
The diff coverage is 54.16%.

@@              Coverage Diff              @@
##             develop    #1574      +/-   ##
=============================================
+ Coverage      46.42%   46.44%   +0.02%     
- Complexity      1714     1717       +3     
=============================================
  Files            350      350              
  Lines          12829    12847      +18     
  Branches        1615     1618       +3     
=============================================
+ Hits            5956     5967      +11     
- Misses          6225     6232       +7     
  Partials         648      648

Impacted Files	Coverage Δ	Complexity Δ
...in/java/io/seata/server/session/GlobalSession.java	84.54% <100%> (-0.08%)	67 <2> (ø)
.../java/io/seata/server/lock/DefaultLockManager.java	52.27% <50%> (-7.73%)	12 <4> (+3)
...server/store/file/FileTransactionStoreManager.java	47.38% <0%> (+1.39%)	19% <0%> (ø)	⬇️

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[slievrly]

LGTM

[xingfudeshi]

LGTM