[3.2 -> 4.0] TraceAPI: Correctly convert return value via ABI

[heifner]

• Use action result type ABI for action return value conversion by ABI.
• Only attempt conversion if an action return value ABI is available.
• Updated tests to verify action return value handling.

Note: No replay of data is needed. trace_api_plugin was storing the data correctly on disk.

Merges release/3.0 into release/4.0 including #2246

Resolves #2228

[ericpassmore]

Note:start
group: STABILITY
category: BUG
summary: Correctly convert return value via ABI, allowing binary to variant conversation without crashing.
Note:end