FINERACT-2291: New command processing - update and delete group

[nidhiii128]

Description

Migrates the "update group" (PUT /v1/groups/{groupId}) and "delete group" (DELETE /v1/groups/{groupId}) REST endpoints from the legacy JSON-blob command-processing path to the new typed fineract-command framework.

Scope (PR 2 of 3 for FINERACT-2291)

• New typed GroupUpdateRequest / GroupUpdateResponse POJOs with Jakarta Validation
• New typed GroupDeleteRequest / GroupDeleteResponse POJOs
• New GroupUpdateCommand, GroupDeleteCommand and their corresponding handlers using CommandHandler<REQ, RES>
• GroupingTypesWritePlatformService gets new typed updateGroup(GroupUpdateRequest) and deleteGroup(GroupDeleteRequest) overloads. Legacy methods kept since they're still used by DeleteCenterCommandHandler and other code paths.
• Controller methods now route through CommandDispatcher
• AntMatchers added in SecurityConfig for PUT /api/*/groups/* (UPDATE_GROUP) and DELETE /api/*/groups/* (DELETE_GROUP)
• Resilience4j configuration added for commandGroupUpdate and commandGroupDelete
• 7 translation keys added to ValidationMessages.properties
• Legacy UpdateGroupCommandHandler and DeleteGroupCommandHandler deleted
• Removed trivial @ApiResponse(200) and @RequestBody swagger annotations on the migrated endpoints (return types are self-describing)

Expected CI failure

run-api-backward-compatibility will fail due to removal of trivial @ApiResponse(200) annotations — same as PR #5952 (per @vidakovic's guidance).

Checklist

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