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Rodrigo ZhouandGitHub 3e7bcd7194 Add root workflow execution to mutable state (#5520)
## What changed?
<!-- Describe what has changed in this PR -->
Add root workflow execution to mutable state.

The root workflow execution is defined as follows:
1. A workflow without parent workflow is its own root workflow.
2. A workflow that has a parent workflow has the same root workflow as
its parent workflow.

Examples:
- Scenario 1: Workflow W1 starts child workflow W2, and W2 starts child
workflow W3.
  - The root workflow of all three workflows is W1.
- Scenario 2: Workflow W1 starts child workflow W2, and W2 continued as
new W3.
  - The root workflow of all three workflows is W1.
- Scenario 3: Workflow W1 continued as W2.
  - The root workflow of W1 is W1 and the root workflow of W2 is W2.

## Why?
<!-- Tell your future self why have you made these changes -->
We want to add this information to Visibility, so it can list all
workflows based on the root execution.

## How did you test it?
<!-- How have you verified this change? Tested locally? Added a unit
test? Checked in staging env? -->
Changed existing tests to check the root workflow execution is being
correctly set.
- Checked history event in the start workflow, start child workflow and
continue as new workflow.
- 

## Potential risks
<!-- Assuming the worst case, what can be broken when deploying this
change to production? -->

## Documentation
<!-- Have you made sure this change doesn't falsify anything currently
stated in `docs/`? If significant
new behavior is added, have you described that in `docs/`? -->

## Is hotfix candidate?
<!-- Is this PR a hotfix candidate or does it require a notification to
be sent to the broader community? (Yes/No) -->
2024-04-09 18:04:02 -05:00
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