Improve transaction payment and DEX swap

[zjb0807]

Closes: #2834

1. Modified transfer order in swap_from_pool_or_dex of transaction_payment, transfer native token from the pool to the user, then the user transfers other tokens to the pool.

• to ensure the account remains alive (keep-alive check)
• to ensure sufficient native balance for storage fees when transferring ERC20 tokens

2. Enhanced DEX swap logic:

• added check for ACA as a swap-in token(prevents the account from being killed when the user only holds the native balance and tries to swap all of the native balance)

[codecov]

Codecov Report

Attention: Patch coverage is 55.77558% with 134 lines in your changes missing coverage. Please review.

Project coverage is 61.59%. Comparing base (9c6d516) to head (a9e3565).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
modules/transaction-payment/src/lib.rs	34.92%	41 Missing ⚠️
modules/currencies/src/lib.rs	55.55%	20 Missing ⚠️
modules/dex/src/lib.rs	75.00%	20 Missing ⚠️
modules/cdp-treasury/src/lib.rs	52.00%	12 Missing ⚠️
modules/cdp-engine/src/lib.rs	37.50%	10 Missing ⚠️
modules/honzon-bridge/src/lib.rs	50.00%	10 Missing ⚠️
modules/incentives/src/lib.rs	62.50%	6 Missing ⚠️
modules/liquid-crowdloan/src/lib.rs	44.44%	5 Missing ⚠️
modules/homa/src/lib.rs	69.23%	4 Missing ⚠️
modules/loans/src/lib.rs	60.00%	4 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2845      +/-   ##
==========================================
- Coverage   61.64%   61.59%   -0.05%     
==========================================
  Files          67       68       +1     
  Lines        9558    10207     +649     
==========================================
+ Hits         5892     6287     +395     
- Misses       3666     3920     +254     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.