ref(discover): Convert ResultsChart components to functional

[sentry]

This PR converts two React class components, ResultsChart and ResultsChartContainer, located in static/app/views/discover/results/resultsChart.tsx, into functional components using React hooks.

Specifically, for ResultsChartContainer:

• The yAxisOptions state and UNSAFE_componentWillReceiveProps lifecycle method have been replaced with a useMemo hook to derive yAxisOptions from eventView.
• The shouldComponentUpdate method has been replaced by wrapping the functional component in React.memo with a custom comparison function.
• The CustomMeasurementsContext.Consumer render prop has been updated to use the useContext hook.
• The withApi Higher-Order Component has been removed, and the api client is now obtained using the useApi hook directly within the component.

For ResultsChart:

• The shouldComponentUpdate method has been replaced by wrapping the functional component in React.memo with a custom comparison function.

These changes align the components with the project's no-class-components coding convention, improving maintainability and leveraging modern React practices.

Legal Boilerplate

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

Fixes CODING-CONVENTIONS-4R7

_{@sentry <feedback>: Autofix iterates on these changes
@sentry stop iterating: Autofix stops iterating on this run}

[github-actions]

📊 Type Coverage Diff

Metric	Before	After	Delta
Coverage	95.56%	95.56%	±0%
Typed	140,020	140,024	🟢 +4
Untyped	6,511	6,510	🟢 -1

🔍 1 new type safety issue introduced

any-typed symbols (1 new)

File	Line	Detail
static/app/views/discover/results/resultsChart.tsx	180	api (var)

This is informational only and does not block the PR.