Use admin theme colors, instead of hardcoded ones

[PanosSynetos]

While working on

• pdqkbG-2Tq-p2#comment-1471
• https://github.com/woocommerce/woocommerce/pull/39182

I noticed that Subscriptions is introducing a "pink" icon with hardcoded color, on the Payments Settings page.

This icon color is at

• https://github.com/Automattic/woocommerce-subscriptions-core/blob/507720f600363a6c1e7da1b4b82660c7ab6a0c0e/assets/css/admin.css#L738C10-L738C16

But there are more places with hardcoded pink colors, here's a list of all different pinks in the CSS files

• #9c5d90
• #a46497
• #cc99c2
• #b366a4
• #bb77ae
• #aa559a

I'd recommend these colors to change to var(--wp-admin-theme-color) or var(--wp-admin-theme-color-darker-10)

The color changes introduced in PR woocommerce/woocommerce/pull/39182 will be released in WC 8.1

[samnajian]

See more context pdqkbG-2Tq-p2#comment-1439