Add missing backend.Commit() to log emitter deployment

[reductionista]

There have been a few LogPoller flakes lately due to this. Looks like calling Commit() between each call to a gethwrapper function is required for the latest version of simulated geth to avoid a race where it can send two tx's in a row with the same nonce before it's incremented.

BCFR-1081

[github-actions]

AER Report: CI Core

aer_workflow , commit , Detect Changes , Clean Go Tidy & Generate , Scheduled Run Frequency , Flakeguard Root Project / Get Tests To Run , lint , Core Tests (go_core_tests) , Flakeguard Deployment Project , Core Tests (go_core_tests_integration) , Core Tests (go_core_ccip_deployment_tests) , Core Tests (go_core_race_tests) , Core Tests (go_core_fuzz) , Flakeguard Root Project / Run Tests (github.com/smartcontractkit/chainlink/v2/core/chains/evm/logpoller, ubuntu-latest) , Flakey Test Detection , SonarQube Scan , Flakeguard Root Project / Report

1. Error mapping test results to owners: open .github/CODEOWNERS: no such file or directory:[Set combined test results]

Source of Error:

2024/12/03 05:16:40 Error mapping test results to owners: open .github/CODEOWNERS: no such file or directory

**Why**: The error occurred because the script attempted to open the `.github/CODEOWNERS` file, which does not exist in the repository.

Suggested fix: Ensure that the .github/CODEOWNERS file is present in the repository. If the file is not needed, modify the script to skip this step.

2. Encountered test failures:[Run tests]

Source of Error:

2024-12-03T05:05:14.9760867Z Encountered test failures.
2024-12-03T05:05:14.9761306Z go_core_tests exiting with code 1

**Why**: The test suite encountered one or more test failures, causing the process to exit with a non-zero status.

Suggested fix: Review the test results to identify and fix the failing tests. Ensure that all dependencies and configurations are correctly set up for the tests.

3. Process completed with exit code 1:[Run tests with flakeguard]

Source of Error:

2024-12-03T05:16:10.5546529Z ##[error]Process completed with exit code 1.

**Why**: The flakeguard run encountered test failures, leading to a non-zero exit code.

Suggested fix: Investigate the specific tests that failed during the flakeguard run. Address any flaky tests or underlying issues causing the failures.

AER Report: Operator UI CI ran successfully ✅

aer_workflow , commit

[reductionista]

Closed after finding a cleaner way of fixing this:
#15579