Fix SpotBugs SA_FIELD_SELF_ASSIGNMENT warnings in gzip package

- Removed redundant self-assignments in `InfBlocks.java` when restoring state in `case TYPE` and `case DRY`.
- Removed redundant `this.marker = m` assignment in `Inflate.java`.
- Updated `.github/scripts/generate-quality-report.py` to enforce `SA_FIELD_SELF_ASSIGNMENT` check.

Author: google-labs-jules[bot]

CodenameOne/src/com/codename1/io/gzip/Inflate.java

@@ -641,9 +641,6 @@ int inflateSync() {
         z.total_in += p - z.next_in_index;
         z.next_in_index = p;
         z.avail_in = n;
-        if (this.marker != m) {
-            this.marker = m;
-        }
 
         // return no joy or set up to restart on a new block
         if (m != 4) {