FINERACT-2510: Resolve compilation warnings in fineract-core

[Ambika-Sony]

Description

The details regarding these changes are present on the associated Apache Fineract JIRA ticket.
Summary of work:
Resolved 45 compilation warnings in the fineract-core module,
Replaced deprecated ObjectUtils.defaultIfNull and Date(String) constructor.
Fixed unchecked casts and raw type usage in DataEnricherProcessor and InternalExternalEventService.
Verified the module now compiles cleanly with a "BUILD SUCCESSFUL" status.

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• [ x] Acknowledge that we will not review PRs that are not passing the build ("green") - it is your responsibility to get a proposed PR to pass the build, not primarily the project's maintainers.
• [x ] Create/update unit or integration tests for verifying the changes made.
• [ x] Follow our coding conventions.
• [ x] Add required Swagger annotation and update API documentation at fineract-provider/src/main/resources/static/legacy-docs/apiLive.htm with details of any API changes
• [ x] This PR must not be a "code dump". Large changes can be made in a branch, with assistance. Ask for help on the developer mailing list.

Your assigned reviewer(s) will follow our guidelines for code reviews.

[IOhacker]

Please Squash & Commit

[Ambika-Sony]

Please Squash & Commit

did it

[airajena]

Please Squash & Commit

did it

@Ambika-Sony please run ./gradlew spotlessApply spotbugsMain spotbugsTest checkstyleMain checkstyleTest as pre commit checks
Execution failed for task ':fineract-core:spotlessJavaCheck'.

[Incubating] Problems report is available at: file:///home/runner/work/fineract/fineract/build/reports/problems/problems-report.html

The following files had format violations:
src/main/java/org/apache/fineract/infrastructure/core/service/DataEnricherProcessor.java
@@ -34,7 +34,7 @@
········this.enhancers·=·enhancers.orElse(new·ArrayList<>());
····}

      -····@SuppressWarnings({"unchecked",·"rawtypes"})
      +····@SuppressWarnings({·"unchecked",·"rawtypes"·})
       ····public·<T>·T·enrich(T·source)·{
       ········for·(DataEnricher·enhancer·:·enhancers)·{
       ············if·(enhancer.isDataTypeSupported(source.getClass()))·{

Run './gradlew :fineract-core:spotlessApply' to fix these violations.

• Try:

Run with --stacktrace option to get the stack trace.
Run with --info or --debug option to get more log output.
Get more help at https://help.gradle.org./`
`

[Ambika-Sony]

Please Squash & Commit

did it

@Ambika-Sony please run ./gradlew spotlessApply spotbugsMain spotbugsTest checkstyleMain checkstyleTest as pre commit checks Execution failed for task ':fineract-core:spotlessJavaCheck'.

[Incubating] Problems report is available at: file:///home/runner/work/fineract/fineract/build/reports/problems/problems-report.html

The following files had format violations:
src/main/java/org/apache/fineract/infrastructure/core/service/DataEnricherProcessor.java
@@ -34,7 +34,7 @@
········this.enhancers·=·enhancers.orElse(new·ArrayList<>());
····}

      -····@SuppressWarnings({"unchecked",·"rawtypes"})
      +····@SuppressWarnings({·"unchecked",·"rawtypes"·})
       ····public·<T>·T·enrich(T·source)·{
       ········for·(DataEnricher·enhancer·:·enhancers)·{
       ············if·(enhancer.isDataTypeSupported(source.getClass()))·{

Run './gradlew :fineract-core:spotlessApply' to fix these violations.

• Try:

Run with --stacktrace option to get the stack trace.
Run with --info or --debug option to get more log output.
Get more help at [https://help.gradle.org./](https://help.gradle.org./%60)

I'v successfully run spotlessApply, spotbugs, and checkstyle locally as requested, and the build is passing. Thank you for the guidance.