test: add coverage for 'add_inputs' dynamic default value

Covered cases for send() and walletcreatefundedpsbt() RPC commands:

1. Default add_inputs value with no preset inputs (add_inputs=true):
       Expect: automatically add coins from the wallet to the tx.

2. Default add_inputs value with preset inputs (add_inputs=false):
       Expect: disallow automatic coin selection.

3. Explicit add_inputs=true and preset inputs (with preset inputs not-covering the target amount).
       Expect: include inputs from the wallet.

4. Explicit add_inputs=true and preset inputs (with preset inputs covering the target amount).
       Expect: only preset inputs are used.

5. Explicit add_inputs=true, no preset inputs (same as (1) but with an explicit set):
       Expect: include inputs from the wallet.

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