Provide installed a11y services/activities from dynamicRawData for search

Bug: 354076686
Flag: com.android.settings.accessibility.fix_a11y_settings_search
Test: Search Project Relate and verify the item shows up in the search
result
Test: Search Talkback with keywords, verify the Talkback shows up in the
search result
Test: atest AccessibilitySettingsTest

Change-Id: I258ecb0928308b7cde30c12104408e11cc25ecd5