Renamed columns in assessment SQL queries to use actual names, not aliases (#983)

## Changes
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screenshots when necessary -->
Aliases are usually not allowed in projections (as they are replaced
later in the query execution phases). While the DBSQL was smart enough
to handle the references via aliases, for some setups this results in an
error. Changing column references to use actual names fixes this.

### Linked issues
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Resolves #980

### Functionality 

- [ ] added relevant user documentation
- [ ] added new CLI command
- [ ] modified existing command: `databricks labs ucx ...`
- [ ] added a new workflow
- [ ] modified existing workflow: `...`
- [ ] added a new table
- [ ] modified existing table: `...`

### Tests
<!-- How is this tested? Please see the checklist below and also
describe any other relevant tests -->

- [x] manually tested
- [ ] added unit tests
- [ ] added integration tests
- [ ] verified on staging environment (screenshot attached)

Author: larsgeorge-db

src/databricks/labs/ucx/queries/assessment/main/03_0_database_summary.sql

@@ -18,7 +18,7 @@ WITH table_stats AS (
         WHEN STARTSWITH(location, "adl") THEN 1
         ELSE 0
     END AS is_unsupported,
-    IF(format = "DELTA", 1, 0) AS is_delta
+    IF(table_format = "DELTA", 1, 0) AS is_delta
    FROM $inventory.tables
 ), database_stats AS (
   SELECT `database`,

src/databricks/labs/ucx/queries/assessment/main/05_0_all_tables.sql

@@ -14,7 +14,7 @@ SELECT CONCAT(tables.`database`, '.', tables.name) AS name,
            WHEN STARTSWITH(location, "adl") THEN "UNSUPPORTED"
            ELSE "EXTERNAL"
        END AS storage,
-       IF(format = "DELTA", "Yes", "No") AS is_delta,
+       IF(table_format = "DELTA", "Yes", "No") AS is_delta,
        location,
        CASE
             WHEN size_in_bytes IS null THEN "Non DBFS Root"