refactor: simplify delete_token_nft_allowance_all_serials entry handling

[Dosik13]

Description:

Simplify AccountAllowanceApproveTransaction.delete_token_nft_allowance_all_serials so that each call produces its own TokenNftAllowance entry. Repeated or chained calls on the same (token, spender) pair are no longer folded into a single entry

• Update delete_token_nft_allowance_all_serials to append a new TokenNftAllowance entry per call instead of folding into an existing entry
• Add unit test covering approve_token_nft_allowance followed by delete_token_nft_allowance_all_serials on the same (token, spender) pair
• Add unit test covering repeated delete_token_nft_allowance_all_serials calls on the same (token, spender) pair
• Add e2e test covering approve_token_nft_allowance followed by delete_token_nft_allowance_all_serials on the same (token, spender) pair

Related issue(s):

Fixes #

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main    #2294      +/-   ##
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+ Coverage   93.97%   94.01%   +0.03%     
==========================================
  Files         163      163              
  Lines       10408    10403       -5     
==========================================
- Hits         9781     9780       -1     
+ Misses        627      623       -4     

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 0f0c52fa-7fce-4471-ab24-1c3e8995d360

📥 Commits

Reviewing files that changed from the base of the PR and between 09e5dad and 98872be.

📒 Files selected for processing (2)

• tests/integration/account_allowance_e2e_test.py
• tests/unit/account_allowance_approve_transaction_test.py

Walkthrough

This PR modifies the delete_token_nft_allowance_all_serials method to append new allowance entries instead of updating existing ones. It removes the merge logic, adds unit tests validating the append behavior, and includes an integration test for the combined scenario of approving a specific serial and deleting all-serials in one transaction.

Changes

NFT Allowance Delete-All-Serials Append Behavior

Layer / File(s)	Summary
Remove delete-all-serials merge logic src/hiero_sdk_python/account/account_allowance_approve_transaction.py	The conditional branch that updated an existing nft_allowances entry for the same token_id + spender_account_id pair has been removed from _approve_token_nft_allowance_all_serials, eliminating the merge/update behavior.
Unit tests for delete-all-serials append behavior tests/unit/account_allowance_approve_transaction_test.py	Two new tests verify that delete_token_nft_allowance_all_serials appends rather than merges: one confirms prior per-serial approvals are preserved as separate entries, and another confirms repeated delete-all-serials calls each create a distinct allowance entry.
Integration test for combined serial approval and delete-all scenario tests/integration/account_allowance_e2e_test.py	New integration test exercises approving allowance for a specific NFT serial while deleting all-serials for the same token/owner/spender pair in a single transaction, verifying the approved NFT transfers succeed and others fail with SPENDER_DOES_NOT_HAVE_ALLOWANCE. Import and function signature formatting updated for consistency.

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🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and accurately summarizes the main change: simplifying the delete_token_nft_allowance_all_serials method's entry handling logic.
Description check	✅ Passed	The description is directly related to the changeset, providing context about the behavioral change and listing all modifications made across implementation and tests.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor/nft-allowance-delete

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Actionable comments posted: 2

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 7edca58d-7060-48d8-be10-931fb8c85687

📥 Commits

Reviewing files that changed from the base of the PR and between 2977e47 and 09e5dad.

📒 Files selected for processing (3)

• src/hiero_sdk_python/account/account_allowance_approve_transaction.py
• tests/integration/account_allowance_e2e_test.py
• tests/unit/account_allowance_approve_transaction_test.py

💤 Files with no reviewable changes (1)

• src/hiero_sdk_python/account/account_allowance_approve_transaction.py