Stats: Display chart with stable 30-minute series data

[dognose24]

Related to #99419

Proposed Changes

• Generate a 30-minute data series as the stable display.
• Adjust the tickFormat for the X-axis to display -0m ~ -30m labels.
• Add yScale.domain to align 0 to the bottom of the Y-axis when no views are fetched.

Why are these changes being made?

• A follow-up to tweak the real-time chart with data and options.

Testing Instructions

• Spin this change up with the Calypso Live branch.
• Navigate to Stats > Realtime tab with the feature flag: stats/real-time-tab.
• Ensure the chart displays all 30 minutes of data with the correct view differences.

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
  • For UI changes, have we tested the change in various languages (for example, ES, PT, FR, or DE)? The length of text and words vary significantly between languages.
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-132796

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-132796&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-132796&env=a8c-for-agencies

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Async-loaded Components (~176 bytes added 📈 [gzipped])

name                                                     parsed_size           gzip_size
async-load-calypso-my-sites-stats-pages-realtime              +361 B  (+3.4%)      +98 B  (+2.7%)
async-load-calypso-my-sites-stats-components-line-chart       +128 B  (+0.0%)      +78 B  (+0.1%)

React components that are loaded lazily, when a certain part of UI is displayed for the first time.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[kangzj]

Beautiful! Great work 👍

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• notifications
• odyssey-stats
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug updat/stats_realtime_adjust_chart_data_and_options on your sandbox.