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<https://github.com/The-OpenROAD-Project/OpenLane/pull/1597|#1597 `run_designs` fixes>
Pull request opened by <https://github.com/donn|donn>
• Add JSON support to "matrix" mode  
    ~ Rename "regression mode" to "matrix", as it more accurately reflects a combination of variables  
    ~ Replace bizzare "regression script" with a JSON file achieving basically the same thing  
    ~ `run_designs` now clears run paths before it starts  
    ~ `run_designs` no longer attempts to generated reports for runs that fail at startup  
    ~ `verify_versions` no longer attempts to check the PDK if the environment variable PDK is not set  
    ~ `scripts/config/config.py:get_config` -&gt; `get_config_for_run` (more accurate)  
    ~ `scripts/config/tcl.py:read_tcl_env` no longer exits unilaterally, raises an exception normally

• Remove Test <https://github.com/The-OpenROAD-Project/OpenLane/issues/892|#892>
• Remove `Tcl` support from matrix mode: not tenable
• Remove Tcl extraction shell script

* * *

Resolves <https://github.com/The-OpenROAD-Project/OpenLane/issues/1458|#1458>
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>
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