Remove useCase and defaultParams field in WorkflowRequest

[junweid62]

Description

• Removed useCase And defaultParams since the WorkflowRequest class doesn't serialize the use case and default parameters over transport.

• Also removed the constructor that has never been used in our code base

Related Issues

Resolves #758

Check List

• New functionality includes testing.
• [ ] New functionality has been documented.
• [ ] API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• [ ] Public documentation issue/PR created.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.08%. Comparing base (9b9ebb2) to head (f5f777d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #952   +/-   ##
=========================================
  Coverage     78.07%   78.08%           
+ Complexity      996      993    -3     
=========================================
  Files            99       99           
  Lines          4625     4617    -8     
  Branches        431      431           
=========================================
- Hits           3611     3605    -6     
+ Misses          834      832    -2     
  Partials        180      180           

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[dbwiddis]

LGTM, but not sure if the removed tests are completely duplicated somewhere else or provide at least one interesting change worth testing (even if not the new params)

[dbwiddis]

Also removed the constructor that has never been used in our code base

Although this comment seems to be the "new thing" that was tested so probably good to remove.

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/flow-framework/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/flow-framework/backport-2.x
# Create a new branch
git switch --create backport/backport-952-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 219aec5c1b85b8aa3e5e15cdf0029c13666ae37e
# Push it to GitHub
git push --set-upstream origin backport/backport-952-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/flow-framework/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-952-to-2.x.