Telescopetest-io: Improve metrics tab display and clean up bloated components

[Judyzc]

• Main work in AllMetrics.astro, a component used as a Tab under telescopetest.io/results/[testId]. This calls on the helper functions in lib/allmetrics/
• Timing bar visualization for navigation timings based off of MDN's diagram: https://developer.mozilla.org/en-US/docs/Web/API/PerformanceNavigationTiming
• Tested in staging

Also did a lot of file/naming cleanup, which made this PR kind of ugly:

• Deleted all unnecessary components/metrics astro files
• Renamed Summary.astro component to MetricCard.astro
• Renamed MetricSection.astro component to Section.astro
• Renamed lib/types/results.ts to lib/types/metrics.ts, now this file is just for metrics
• Separated CWV calculations from other performance and web vital calculations

Additional things to add in future:

• Make user timing marks vertical ticks on the navigation timing visualization

Closes #191

[sergeychernyshev]

We did discuss a few changes off-line. Let me know when you have those ready and we can merge.

[sergeychernyshev]

More changes, unfortunately - see comments inline.

I also could not find where it is, but I can't see loadEventStart on the chart - it is listed in the timestamps, but when I hover over it, nothing is highlighted.

[sergeychernyshev]

I am seeing inconsistent measurements, e.g. derived metrics (specifically DCL and Page Load) are not displayed with the correct values,

[sergeychernyshev]

I also see some font overlap among the metrics (my browser's font size is increased and not a default) - it looks like you're hard-coding the height of each line for each metric, as inline styles - it is probably better to let them be laid out naturally by putting them in the same div one after another and just setting the left position to match the vertical lines.

[sergeychernyshev]

I do see "TTFB (responseStart)" label for derived metric, but not for DCL or Page Load

[sergeychernyshev]

I believe we're good to go for this second pass with a fun diagram!

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