[PR] Add agent synchronization statistics

[asteriscos]

Hi team,

this adds agent synchronization statistics to the Agents Summary view. Also includes agents Pending status to the doughnut chart.

Closes #3402 #3836

[github-actions[bot]]

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[yenienserrano]

The endpoint response type has been modified GET /agents/summary/status, so the controllers using this endpoint have been updated.

Test:

1. Navigate to the following views: - Overview - Management/Status - Agents
2. The number of agents in the different states should be displayed.
3. In the agent module, there should be a Synchronized column in the table, indicating whether the agent's configuration is synchronized.

[Mayons95]

TR :heavy_check_mark: LGTM ! Test OK Evidence Attached

[github-actions[bot]]

The backport to 4.4-7.16 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-4.4-7.16 4.4-7.16
# Navigate to the new working tree
cd .worktrees/backport-4.4-7.16
# Create a new branch
git switch --create backport-3874-to-4.4-7.16
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 44570272566d78fb5ae772b0f9a3061af66171aa
# Push it to GitHub
git push --set-upstream origin backport-3874-to-4.4-7.16
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-4.4-7.16

Then, create a pull request where the base branch is 4.4-7.16 and the compare/head branch is backport-3874-to-4.4-7.16.