Move undo & save buttons in top-level header

[ohltyler]

Description

Moves the undo & save buttons in the top-level header of the Workflow Details page. In order to do this, a lot of the state scoped within WorkflowInputs had to be lifted up the dependency tree, in order to be accessible in the header component, where the buttons were relocated to. The majority of this PR is just refactoring the state and related props to/from the parent/child components.

Other notable changes include:

• adding the save/undo buttons to the TopNavMenu so they are visible when useNewHomePage : true
• fixing an endless loop bug in the test utils that was throttling the tests. By moving some of this state in WorkflowDetails, it actually would timeout and the tests would fail. After optimizing, there is no unnecessary rendering happening
• moves CONFIG_STEP as a consumable global constant to be accessed by all child components

Screenshots:

Check List

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[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/dashboards-flow-framework/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/dashboards-flow-framework/backport-2.x
# Create a new branch
git switch --create backport/backport-435-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 d4123fa9d057f4dcb834115c5599a6c8f0044259
# Push it to GitHub
git push --set-upstream origin backport/backport-435-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/dashboards-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-435-to-2.x.

[ohltyler]

Will wait for #434 to merge and then retry backport.