Fixed old-style event log scanner for IMA messages

[sergiy-skalelabs]

• Fixed old-style event log scanner for IMA messages
• Added details about iterative event search
• No new APIs added
• No function arguments changed
• No new tests needed

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (17a59ef) 85.79% compared to head (cb1b576) 85.79%.

:exclamation: Current head cb1b576 differs from pull request most recent head f0ab2aa. Consider uploading reports for the commit f0ab2aa to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1633 +/- ## ======================================== Coverage 85.79% 85.79% ======================================== Files 26 26 Lines 1464 1464 Branches 401 401 ======================================== Hits 1256 1256 Misses 33 33 Partials 175 175 ```

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