FINERACT-2533: Remove @Skip tags from savings account E2E scenarios

[awaneetdecoder]

Removes @Skip annotations from scenarios C2438, C2439, and C2440 in SavingsAccount.feature.

These scenarios were skipped because SavingsAccountRequestFactory hardcoded
EUR_SAVING_PRODUCT_ID = 1L which did not exist in the E2E environment.

PR #5646 fixed the root cause by dynamically creating the EUR savings product via
SavingsProductRequestFactory.defaultSavingsProductRequest() and storing its ID in
TestContextKey.DEFAULT_SAVINGS_PRODUCT_CREATE_RESPONSE_EUR.

The "And Admin creates a EUR savings product" step is now added to C2438, C2439,
and C2440 (already present in C2441 from PR #5646), making the skip reason obsolete.

Closes FINERACT-2533

[awaneetdecoder]

@adamsaghy As requested, removed the @Skip tags from C2438, C2439, and C2440.
Added the "And Admin creates a EUR savings product" step to each scenario to
dynamically create the product, same approach as C2441 in PR #5646.

[awaneetdecoder]

@adamsaghy During CI, scenarios C2439, C2440, and C2441 were failing with a 403
"Unknown data integrity issue with savings product" error. The root cause was that
SavingsProductRequestFactory.defaultSavingsProductRequest() used a hardcoded product
name "CEUR" — when multiple scenarios run sequentially in the same DB session, the
second scenario hits a unique constraint violation trying to create a product with
the same name.

Fixed by appending a 4-character UUID suffix to both the product name and short name,
making each scenario's product creation independent. All 43 checks are now passing.