A11y: fix insufficient color contrast

[eledobleefe]

What is this feature?

To check if the color contrast in ConnectionsRedirectNotice is still failing the pa11y checks.

Why do we need this feature?

To check if this issue with the color contrast is related to these external bugs: pa11y reports false positives for color contrast & pa11y reports an axe warning as an error

Who is this feature for?

Everyone

Which issue(s) does this PR fix?:

Fixes #

Special notes for your reviewer:

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.

[eledobleefe]

The issue was closed and so will this PR.