Unified Storage: Make all dashboard fields searchable (#98899)

* wip. adding sprinkles fields.

* some refactoring. Works with sprinkles now.

* exclude top level dashboard hit fields from hit "fields"

* adds unit test for DecodeCell helper

* test can search for specific dashboard fields on bleve index

* adds search handler tests for the fields and tests for fields when transforming the search req to a bleve search req

* fix panic when calling fields.Set() with int32

* adds regression test

* remove unneeded method on test mock client

* fix linter issues

* updates dashboard test data for bleve tests

* remove DASHBOARD_LEGACY_ID from bleve_tests

* dont cast twice

* updates test to sort by dashboard_views_last_1_days

* declare excludedFields outside of function

* fixes sorting by dashboard fields - prepends "fields." to any dashboard fields we try to sort by

* uses map for excludedFields

* expects fields to be array-style url param

* change method name

* fixes failing tests - needed to add column type to mocks

pkg/storage/unified/resource/document.go

@@ -237,6 +237,8 @@ func (x *searchableDocumentFields) Fields() []string {
 }
 
 func (x *searchableDocumentFields) Field(name string) *ResourceTableColumnDefinition {
+	name = strings.TrimPrefix(name, "fields.")
+
 	f, ok := x.fields[name]
 	if ok {
 		return f.def