Fix Gradle deprecated property assignment warnings in build files

[kedarvenkateshkumar]

Summary

Fixed Gradle deprecated property assignment syntax warnings
in multiple build.gradle files across the project.

Changes

• build.gradle: Fixed propName value → propName = value syntax
• fineract-doc/build.gradle: Fixed same syntax warnings
• fineract-war/build.gradle: Fixed compression, enabled properties
• integration-tests/build.gradle: Fixed containerId property
• oauth2-tests/build.gradle: Fixed containerId property

Testing

Command: gradlew.bat compileJava --warning-mode all
Result: BUILD SUCCESSFUL - warnings resolved

[airajena]

• Access Apache Fineract Jira and assign yourself the ticket
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• Fork the Apache Fineract repository
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• Build in your local dev environment and confirm that there are no issues
• Sign the commit and set the comment using the "FINERACT-{NUMBER}: {Jira text title}"
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• Please be patient, there are several PRs at this moment and it is possible that maintainer will request to do rebase

[IOhacker]

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