Improve baseline comparison (#817)

* Do not force unsupported metrics to be specified in older gpu
  architectures as None

* Remove metrics which are explicitly set to None

* Update CHANGELOG

* Fix analysis configuration to fix baseline comparisons across all gpu
  architectures
    * Add missing 1812 section for gfx908
    * Add missing 1812 section for gfx90a

* Baseline comparision will only show common metrics
   * First workload will be used to set Metric ID index column

[ROCm/rocprofiler-compute commit: d4c316a730]

projects/rocprofiler-compute/src/utils/file_io.py

@@ -75,6 +75,12 @@ def load_panel_configs(dir):
             if f.endswith(".yaml"):
                 with open(str(Path(root).joinpath(f))) as file:
                     config = yaml.safe_load(file)
+                    # metric key can be None due to some metric tables not having any metrics
+                    # metric key should be empty dict instead of None
+                    for data_source in config["Panel Config"]["data source"]:
+                        metric_table = data_source.get("metric_table")
+                        if metric_table and metric_table["metric"] is None:
+                            metric_table["metric"] = {}
                     d[config["Panel Config"]["id"]] = config["Panel Config"]
 
     # TODO: sort metrics as the header order in case they are not defined in the same order