[Fix] Add validation for run_as_mode in databricks_query (#4233)

## Changes
<!-- Summary of your changes that are easy to understand -->

Resolves #4228

## Tests
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How is this tested? Please see the checklist below and also describe any
other relevant tests
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- [x] `make test` run locally
- [x] relevant change in `docs/` folder
- [ ] covered with integration tests in `internal/acceptance`
- [ ] relevant acceptance tests are passing
- [ ] using Go SDK

docs/resources/query.md

@@ -34,7 +34,7 @@ The following arguments are available:
 * `catalog` - (Optional, String) Name of the catalog where this query will be executed.
 * `schema` - (Optional, String) Name of the schema where this query will be executed.
 * `description` - (Optional, String) General description that conveys additional information about this query such as usage notes.
-* `run_as_mode` - (Optional, String) Sets the "Run as" role for the object.
+* `run_as_mode` - (Optional, String) Sets the "Run as" role for the object.  Should be one of `OWNER`, `VIEWER`.
 * `tags` - (Optional, List of strings) Tags that will be added to the query.
 * `parameter` - (Optional, Block) Query parameter definition.  Consists of following attributes (one of `*_value` is required):
   * `name` - (Required, String) Literal parameter marker that appears between double curly braces in the query text.

sql/resource_query.go

@@ -32,9 +32,7 @@ func (QueryStruct) CustomizeSchema(m *common.CustomizableSchema) *common.Customi
 	m.SchemaPath("warehouse_id").SetRequired().SetValidateFunc(validation.StringIsNotWhiteSpace)
 	m.SchemaPath("parent_path").SetCustomSuppressDiff(common.WorkspaceOrEmptyPathPrefixDiffSuppress).SetForceNew()
 	m.SchemaPath("owner_user_name").SetSuppressDiff()
-	m.SchemaPath("run_as_mode").SetSuppressDiff()
-	//m.SchemaPath("").SetSuppressDiff()
-	//m.SchemaPath("").SetSuppressDiff()
+	m.SchemaPath("run_as_mode").SetSuppressDiff().SetValidateFunc(validation.StringInSlice([]string{"VIEWER", "OWNER"}, false))
 	m.SchemaPath("id").SetReadOnly()
 	m.SchemaPath("create_time").SetReadOnly()
 	m.SchemaPath("lifecycle_state").SetReadOnly()