mpm integration-test: fix discarded txn

[pause125]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

当前代码会尝试将 Discard txn 添加到 txn_accumulator 中，而 txn_accumulator 只接受 KeptVMStatus 的 txn，因此在 check 时遇到了 Discard 的 txn， 从而发生 panic 。

Issue Number: N/A

What is the new behavior?

• Bug fixed

Other information

相关 issue： starcoinorg/starcoin-framework#95 (comment)

[codecov]

Codecov Report

Merging #3691 (0943f76) into master (c6634ad) will decrease coverage by 0.09%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3691      +/-   ##
==========================================
- Coverage   28.50%   28.41%   -0.08%     
==========================================
  Files         588      588              
  Lines       50411    50412       +1     
  Branches    23657    23657              
==========================================
- Hits        14364    14322      -42     
+ Misses      22242    22224      -18     
- Partials    13805    13866      +61     

Flag	Coverage Δ
unittests	28.41% <0.00%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
vm/starcoin-transactional-test-harness/src/lib.rs	0.15% <0.00%> (-<0.01%)	⬇️
vm/natives/src/account.rs	12.50% <0.00%> (-12.50%)	⬇️
vm/natives/src/token.rs	17.78% <0.00%> (-8.88%)	⬇️
network-p2p/src/peer_info.rs	43.53% <0.00%> (-4.66%)	⬇️
vm/types/src/on_chain_config/mod.rs	38.36% <0.00%> (-4.10%)	⬇️
txpool/src/pool/listener/tests.rs	10.91% <0.00%> (-3.63%)	⬇️
types/src/account_state.rs	56.67% <0.00%> (-3.33%)	⬇️
vm/types/src/token/stc.rs	63.24% <0.00%> (-2.94%)	⬇️
vm/vm-runtime/src/starcoin_vm.rs	32.39% <0.00%> (-2.46%)	⬇️
types/src/startup_info.rs	61.49% <0.00%> (-2.22%)	⬇️
... and 62 more

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[baichuan3]

其它问题是单独pr修复？

[pause125]

其它问题是单独pr修复？

其他问题是指？

StarcoinFramework 里面 shared_key.move 和 gas_check.move 这两个 case 失败的原因都是因为有 Discard 的交易，从而触发 bug 导致崩溃的。没有其他问题了。

[baichuan3]

验证ok