fix: filter contract events by address before decoding

[rajk93]

fixes #5583

Description

When a contract calls another contract, both emit ContractEmitted events. The current implementation attempts to decode all events using only the calling contract's ABI, resulting in errors like:

CONTRACT: Unable to decode contract event: Unable to find event with index 1
CONTRACT: Unable to decode contract event: Unable to determine event

This occurs because the decoder tries to interpret events from Contract B using Contract A's ABI, as mentioned in #5583 (comment).

This PR filters events by contract address before decoding. Each contract instance now only decodes events where event.data[0] (the emitting contract address) matches this.address. Events from other contracts are skipped and
logged at the debug level for visibility.

Impact on Different Ink Contract Metadata Versions

ink! v4 (metadata v4): Uses index-based event lookup. This fix is critical as it prevents Unable to find event with index X errors when cross-contract calls occur.

ink! v5+ (metadata v5/v6): Uses signature topics for event matching, which provides better event discrimination. However, this fix is still beneficial because it eliminates error logs when signature topics don't match between contracts

[polkadot-js-bot]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.