Fix enum comparison in if predicate for SQL generation

[ad-gs]

processDynaFunction: Disable pushDownEnumTransformations for the predicate of an if function (runs when returns non enum)
processIfForEnum: Same fix for the if path that returns enums. To avoid unquoted identifiers, resolve enum names in branches as string quoted literals

Added tests for scenarios with enum and non enum return types

[github-actions]

Test Results

  1 070 files   -      18    1 070 suites   - 18   3h 12m 36s ⏱️ - 1h 20m 32s
13 638 tests  -      80  13 462 ✔️  -      80  176 💤 ±0  0 ❌ ±0 
32 139 runs   - 2 765  31 963 ✔️  - 2 765  176 💤 ±0  0 ❌ ±0 

Results for commit 52be9d7. ± Comparison against base commit 3c92e3c.