[navigation]fix: remove the workspaceAvailability field to make alert visible within workspace

[SuZhou-Joe]

Description

[Describe what this change achieves]

Before the fix

After fix

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[opensearch-trigger-bot]

The backport to 2.16 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/alerting-dashboards-plugin/backport-2.16 2.16
# Navigate to the new working tree
pushd ../.worktrees/alerting-dashboards-plugin/backport-2.16
# Create a new branch
git switch --create backport-1028-to-2.16
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 0153b94e4279e077e3b2558c14e08027faffb713
# Push it to GitHub
git push --set-upstream origin backport-1028-to-2.16
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/alerting-dashboards-plugin/backport-2.16

Then, create a pull request where the base branch is 2.16 and the compare/head branch is backport-1028-to-2.16.