Miscellaneous Updates (const-correctness, logic fixes, etc.) (#126)

* Update lib/rocprofiler/hsa/hsa.cpp

- fix logic for constructing callback_contexts and buffered_contexts arrays

* Update include/rocprofiler/{agent,fwd,pc_sampling}.h

- remove rocprofiler_pc_sampling_config_array_t due to const problems
- update rocprofiler_agent_t to use arrays to const data
- remove redundant rocprofiler_query_pc_sampling_agent_configurations
  - this implementation is quite literally looking up info in the agent struct that was passed

* Update lib/rocprofiler/pc_sampling.cpp

- remove rocprofiler_query_pc_sampling_agent_configurations

* update lib/rocprofiler/agent.cpp

- handle const fields
- make mi200_pc_sampling_config variable static

* Update lib/rocprofiler/tests/agent.cpp

- tweak to pc_sampling_configs offset

* Update samples/pc_sampling

- Update sample to reflect minor tweaks to pc_sampling_configs in rocprofiler_agent_t

* Update CI workflow

- remove 'if: ${{ always() }}'
  - I suspect this is why the jobs do not cancel in progress correctly

source/lib/rocprofiler/tests/agent.cpp

@@ -97,7 +97,8 @@ TEST(rocprofiler_lib, agent_abi)
     EXPECT_EQ(offsetof(rocprofiler_agent_t, vendor_name), 256) << msg;
     EXPECT_EQ(offsetof(rocprofiler_agent_t, product_name), 264) << msg;
     EXPECT_EQ(offsetof(rocprofiler_agent_t, model_name), 272) << msg;
-    EXPECT_EQ(offsetof(rocprofiler_agent_t, pc_sampling_configs), 280) << msg;
+    EXPECT_EQ(offsetof(rocprofiler_agent_t, num_pc_sampling_configs), 280) << msg;
+    EXPECT_EQ(offsetof(rocprofiler_agent_t, pc_sampling_configs), 288) << msg;
     // Add test for offset of new field above this. Do NOT change any existing values!
 
     // If a new field is added, increase this value by the size of the new field(s)