Remove repeated validation of transaction

[lpoli]

Fixes

Transaction validation is done twice which is redundant.

Changes

Need to be mentioned in CHANGELOG.md?

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• blobber:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[dabasov]

lgtm

[codecov-commenter]

Codecov Report

Merging #2552 (8197a7b) into sprint-july-1 (5bb157f) will increase coverage by 0.00%.
The diff coverage is 0.00%.

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@@              Coverage Diff               @@
##           sprint-july-1    #2552   +/-   ##
==============================================
  Coverage          28.79%   28.79%           
==============================================
  Files                380      380           
  Lines              64106    64101    -5     
==============================================
+ Hits               18458    18461    +3     
+ Misses             43467    43456   -11     
- Partials            2181     2184    +3     

Flag	Coverage Δ
Unit-Tests	28.79% <0.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...ode/go/0chain.net/chaincore/transaction/handler.go	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

[Kishan-Dhakan]

Passing run: https://github.com/0chain/0chain/actions/runs/5468902617/jobs/9957156186