FINERACT: Refactor arrears SQL concatenation to use PreparedStatements

[shubhamchaudhary29]

Description

Replaced raw string concatenation in LoanArrearsAgingServiceImpl with parameterized queries to prevent SQL injection and enable JDBC execution plan caching for batch jobs.

Relying on string concatenation for SQL queries inside a batch job is a standard security anti-pattern, but more importantly, it bypasses JDBC execution plan caching. This creates an unnecessary performance bottleneck on the database engine when updating thousands of overdue loans.

Changes Made:

Ripped out StringBuilder SQL generation in LoanArrearsAgingServiceImpl.

Replaced with highly-optimized, parameterized JdbcTemplate queries.

Updated LoanArrearsAgeingUpdateHandler and LoanArrearsAgingService interface to securely trigger the new execution                method without passing raw SQL strings back and forth.

[adamsaghy]

@shubhamchaudhary29 Should this be targeting apache repo instead, no?

[shubhamchaudhary29]

@shubhamchaudhary29 Should this be targeting apache repo instead, no?

Sorry adam, realised my mistake