fix(search): update disabled state in spectrum two (#3593)

Co-authored-by: rise-erpelding <[email protected]>
Co-authored-by: [ Cassondra ] <[email protected]>

Author: 3 people

.changeset/four-phones-agree.md

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+---
+"@spectrum-css/search": patch
+---
+
+Updated `--spectrum-search-background-color-disabled` to `--spectrum-gray-25` and `--spectrum-search-border-color-disabled` to `--spectrum-gray-300` for the S2 foundations contexts.
+
+Also defines disabled quiet border and background colors (`--system-search-quiet-background-color-disabled` and `--system-search-quiet-border-color-disabled`) in order to maintain disabled quiet styling.