CRINGE-38: Replace metrics-graphics dependency

[Haseeb702]

Purpose:

• To replace the metrics-graphics dependency with a more modern and actively maintained Javascript graphing library: CRINGE-38

This PR:

• Removes all the old dependencies: D3 and metrics-graphics, since they are both used only for the signature graph tab and can be safely removed.
• Removed the custom CSS for metrics-graphics
• Rewrites the signature_tab_graphs.js using chart.js, which is a modern Javascript graphing library to replace the metrics-graphics dependency and the old graphing code

Manual Testing Plan:

• Go to any crash signature report and click on the graphs tab
• Verify that the line graph renders properly, and loads within 2 seconds
• Select a different option in the dropdown menu and verify that a new line graph is drawn with the new option
• Hover your cursor near a line and confirm that data points can be hovered over and display the y-axis and x-axis details
• Resize your window to verify if the graph is scaled correctly

[Haseeb702]

First thing to refactor was the data format, since chart.js doesn't accept the same data format as metrics-graphics.

[Haseeb702]

Here we go through the top 4 terms being graphed and create a list of daily crash counts that align with the date list. The code iterates through the data for each date and maps the daily crash counts to each term. This is how the dataset for the line graph is built.