FINERACT-2577: Allow adjust (modify) of Fixed Deposit transactions

[AshharAhmadKhan]

Description

Fixes a silently broken adjust (modify) transaction endpoint for Fixed Deposit accounts. The bug exists in the same 3-layer pattern as the undo bug fixed by PR #5590 (FINERACT-2463).

Layer 1 — Wrong command builder called:
FixedDepositAccountTransactionsApiResource.java was calling builder.adjustSavingsAccountTransaction(), routing every FD modify request to the SAVINGSACCOUNT command handler instead of FIXEDDEPOSITACCOUNT.

Layer 2 — Missing builder method:
adjustFixedDepositAccountTransaction() did not exist in CommandWrapperBuilder.java. Added with actionName = "ADJUSTTRANSACTION" and entityName = "FIXEDDEPOSITACCOUNT".

Layer 3 — Stub implementation replaced:
adjustFDTransaction() in DepositAccountWritePlatformServiceJpaRepositoryImpl.java was an unconditional stub that always threw DepositAccountTransactionNotAllowedException (both params were @SuppressWarnings("unused")). Replaced with full implementation modelled on the savings account equivalent, with FD-specific behaviour: FixedDepositAccount cast, updateMaturityDateAndAmount(), 7-param postInterest(), and no RD-only calls.

FixedDepositTransactionAdjustmentCommandHandler was already correctly annotated — no changes needed.

Files changed:

• CommandWrapperBuilder.java — added adjustFixedDepositAccountTransaction()
• FixedDepositAccountTransactionsApiResource.java — one-line fix, call FD-specific builder method
• DepositAccountWritePlatformServiceJpaRepositoryImpl.java — full implementation replacing stub
• FixedDepositAccountHelper.java — added adjustFixedDepositTransaction() using typed Feign client
• FixedDepositTest.java — added testFixedDepositAccountAdjustTransaction() with CASH_BASED accounting, journal entry assertions, and reversal verification

No Swagger changes needed — PR #5590 already added the required annotations.

Closes: https://issues.apache.org/jira/browse/FINERACT-2577

[AshharAhmadKhan]

Thanks for the review!

1. Reverted all .gitignore changes.
2. Added proper import for PostFixedDepositAccountsFixedDepositAccountIdTransactionsRequest and removed both inline fully-qualified usages (including the one in undoFixedDepositTransaction from FINERACT-2463: Allow undo of Fixed Deposit transactions #5590).

[AshharAhmadKhan]

Spotless applied, the remaining one check should also pass now.

[AshharAhmadKhan]

@adamsaghy same flaky E2E shard pattern as #5590 — LoanCapitalizedIncome-Part2 assertion failure unrelated to this PR. Let me know if something needs to change.

[DeathGun44]

LGTM

[AshharAhmadKhan]

@adamsaghy pinging you on this one as well , please take a look when you're free! Happy to make any changes if you need.