Protect: Refactor AdminSectionHero

[nateweller]

Proposed changes:

• Changes Protect's AdminSectionHero component to export sub-components, replacing the main and secondary props with AdminSectionHero.Main and AdminSectionHero.Aside.

// old implementation
<AdminSectionHero
    main={ (
        <>
            <AdminSectionHero.Heading showIcon variant="warning">
                Hello, World!
            </AdminSectionHero.Heading>
            <AdminSectionHero.Subheading>
                Code is poetry.
            </AdminSectionHero.Subheading>
        </>
    ) }
    mainClassName="my-main-class-name"
    secondary={ <img src="example.jpg" /> }
    preserveSecondaryOnMobile={ true }
/>

// proposed implementation
<AdminSectionHero>
    <AdminSectionHero.Main className="my-main-class-name">
        <AdminSectionHero.Heading icon="warning">
            Hello, World!
        </AdminSectionHero.Heading>
        <Text>
            Code is poetry.
        </Text>
    </AdminSectionHero.Main>
    <AdminSectionHero.Aside>
        <img src="example.jpg" />
    </AdminSectionHero.Aside>
</AdminSectionHero>

• Adjust AdminSectionHero styling, use flexbox instead of grid.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

#40317 (comment)

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• Review the page headers in Jetpack Protect on various screen sizes and states.

Screenshots

[github-actions]

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[dkmyta]

Great improvements! Made note of one potential area for improvement and a minor nitpick.

In the scanning state at 1100px the inProgressAnimation wraps to a second line. Previously the main section shrunk to fit to a point when the animation became hidden. If thats no longer an option maybe we can just hide it earlier?

Nit - should the FirewallPage status icon/label be spaced out further? Perhaps a similar margin (16px) as the lastCheckedLocalTimestamp in the ScanPage too keep things uniform?

[dkmyta]

LGTM