Fix: Use alt and <title> in UNSTABLE_PartnerLogo and UNSTABLE_ProductLogo

[adamkudrna]

Description

Use the alt attribute and <title> tag to make the inside images accessible.

Issue reference

Discovered in #1618.

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Lighthouse	1 paths audited Performance: 96 (no change from production) Accessibility: 93 (no change from production) Best Practices: 100 (no change from production) SEO: 82 (no change from production) PWA: - View the detailed breakdown and full score reports

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[adamkudrna]

Maybe the first line of the commit message could be better.

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[coveralls]

coverage: 78.732%. remained the same
when pulling 1f0eb2b on fix/product-and-partner-logo
into b04f824 on main.

[crishpeen]

aaaa, doing it in the v3 integration branch would save us (me) a lot of work during the rebase :D

[curdaj]

ParterLogo and ProductLogo are already stabilized in integration/BC-v3-design-tokens