refactor(core): normalized numeric config resolution with env precedence

[aryamohanan]

ref #2409

This is the first PR

Created a util file for shared config helpers and moved and remaned normalizeSingleValue => resolveNumericConfig to the util file

Refactoring plan

• Create a util file for shared config helpers and move resolveNumericConfig to the util file
• Remove deprecated config
• Replace all inline numeric parsing (parseInt, isNaN) with resolveNumericConfig
• Extract tests
• Extract common env parsing logic into util
• Fix and standardize logging messages and consistent format
• Remove duplicated parsing/validation logic
• Normalize boolean handling across config
• Clean up deprecated env handling (isolate or simplify)
• Minor other cleanups

[kirrg001]

I recommend extracting the tests from #2409 as a PR as an early TODO item (I could not see it).
Its okay if some of the tests fail for now on the parent branch.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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