exec results

[novaknole]

Description

Before arriving to this solution, I tried to have getProposal function instead of updateProposalWithFailureMap. getProposal would return the proposal, and dao.ts would update and save it which is much better, but I struggled:

1. The function can't have multiple return types.
2. So, I mentioned TokenVotingProposal in the return type and used changetype<TokenVotingProposal>(MultisigProposal.load(...), but this didn't work as doing save on it failed because of votingMode. Mainly, it thought
   the type was TokenVotingProposal even though underlying thing was MultisigProposal.

Task: ID

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran all tests with success and extended them if necessary.
• I have updated the CHANGELOG.md file in the root folder.
• I have tested my code on the test network.

[Rekard0]

LGTM!