Stats echarts

[karthiek390]

Description

Replaced the metric visualizations on Stats/Tracking page with Apache echarts.

Changes Made

List the main changes made in this PR. Be as specific as possible.

• [X] Feature added
• [X] Bug fixed
• [X] Code refactored
• [ ] Tests changed
• [ ] Documentation updated
• [ ] Other changes: [describe]

Checklist

Before submitting this PR, please make sure that:

• [X] Your code passes linting and coding style checks.
• [ ] Documentation has been updated to reflect the changes.
• [X] You have reviewed your own code and resolved any merge conflicts.
• [X] You have requested a review from at least one team member.
• [ ] Any relevant issue(s) have been linked to this PR.

[karthiek390]

Changes Made:

1.) Fixed the left labels for 3 bar charts: Y-axis labels exceeding 15 characters are truncated to the first 10 characters followed by an ellipsis (...). This improves visual clarity on the y-axis, preventing text overlap or clutter.

2.) Added a subtext explaining what Bandwidth is.

3.) Removed the Slate-Scratch File Quota Utilization Graph

4.) Tooltip Data Usage values are in the readable format (like KBs, TBs).

5.) Displaying the last hour's 'usage' value instead of all the values in a particular day.

6.) Changed the graph title to 'Total no.of users registered', along with the value of total users in the title.