f: removed start and end date from tx actions and made entities immut…

[jordaniza]

Description

This PR merges as follows:

flowchart LR
    fsplit_immutable_transactions("f/immutable-transactions")  --> fsplit_transaction_actions("f/split-transaction-actions") --> fsplit_subgraph("f/split-subgraph") --> fsplit("f/split") --> develop
    other_prs("{other prs}") --> fsplit_subgraph

We are staging these PRs to make reviewing and readability easier but all achieve the same goal: deprecating plugins in OSx core.

Summary of PRs:

• [x] Remove Proposals from Executions, Transfer entities and add deterministic IDs
• [ ] Fix TransactionAction(s) to make them immutable ${\color{Red}<-- This PR}$
• [ ] Remove Plugin data from the Subgraph
• [ ] Rename TransactionActions back to Actions
• [ ] Move ID generation to OSx Commons if needed

This PR

IDAO.execute will now create TransactionActions and Arrays of TransactionAction, these will be uniquely created inside each transaction, so there is never a need to update them.

This PR marks the entities as immutable then removes branching to fetch the entity from the DB if it exists already.

Task ID: OS-1210

Type of change

• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] I have selected the correct base branch.
• [x] I have performed a self-review of my own code.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] My changes generate no new warnings.
• [x] Any dependent changes have been merged and published in downstream modules.
• [x] I ran all tests with success and extended them if necessary.
• [ ] I have updated the CHANGELOG.md file in the root folder.
• [ ] I have updated the DEPLOYMENT_CHECKLIST file in the root folder.
• [ ] I have updated the UPDATE_CHECKLIST file in the root folder.
• [ ] I have updated the Subgraph and added a QA URL to the description of this PR.