[rocm-libraries] ROCm/rocm-libraries#7761 (commit 237b766)

[CK][CK TILE] Clean up tile_engine grouped_conv harness
 (#7761)

## Motivation
Tile_engine grouped_conv contains ML heuristic validation scripts which
cause confusion to new developers. So, this PR is intended to relocate
the scripts into dispatcher/heuristic directory to maintain separation
of concern.

## Technical Details
The grouped_conv tile_engine directory is a benchmarking harness for
grouped convolution kernels; ML-heuristic content does not belong there.

- Move compare_ml_vs_oracle.py and validate_ml_vs_oracle.py from
tile_engine/ops/grouped_conv/ to
dispatcher/heuristics/validation/grouped_conv/, and rebase their
sys.path / oracle CSV / model dir lookups for the new location (CSV path
is now an --oracle-csv flag instead of a hard-coded sibling).
- Move GROUPED_CONV_HEURISTIC_REPORT.md (system-level ML report) into
dispatcher/heuristics/ where the rest of the heuristic docs live.
- Rewrite tile_engine/ops/grouped_conv/README.md as a pure benchmarking
/ dispatcher-sweep doc (kernel enumeration, JIT pipeline, CSV schema,
problem registry), in the style of tile_engine/ops/fmha/README.md. All
ML training / model-efficiency content is removed and replaced with a
pointer to dispatcher/heuristics/.

## Test Plan

Validation scripts are re-wired and tested locally

## Test Result

Tests passed on local machine.

## Submission Checklist

- [x ] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.