Osquerybeat: Fix missing result values when the value can not be converted into expected type

[aleksmaus]

What does this PR do?

Preserve the field original value in the result even if it osquerybeat the type conversion in the case where the column value type doesn't match the actual value type.

For more detailed information refer to the
#33586

Why is it important?

Fixes the issue with missing column value in the query results. In this particular case the queries that use group_concat function are affected.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

How to test this PR locally

Run query

SELECT group_concat(DISTINCT port) as data FROM listening_ports

Verify the one result is returned

Related issues

Screenshots

Verified it's working after the change

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2022-11-06T02:18:32.574+0000

• Duration: 45 min 31 sec

Test stats 🧪

Test	Results
Failed	0
Passed	1632
Skipped	0
Total	1632

💚 Flaky test report

Tests succeeded.

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