Add Positron Variables Pane Methods #1321

Job	Run time
OS=macOS-latest R=release py=3.11	4m 39s
OS=windows-latest R=release py=3.11	8m 47s
OS=ubuntu-latest R=release py=3.11	4m 19s
OS=macOS-latest R=oldrel py=3.11	5m 17s
OS=ubuntu-latest R=oldrel-1 py=3.10	5m 3s
OS=ubuntu-latest R=oldrel-2 py=3.10	4m 19s
OS=ubuntu-20.04 R=oldrel-3 py=3.9	6m 15s
OS=ubuntu-20.04 R=oldrel-4 py=3.9	4m 51s
OS=ubuntu-latest R=release py=3.8	4m 11s
OS=ubuntu-latest R=release py=3.9	4m 20s
OS=ubuntu-latest R=release py=3.11	4m 38s
OS=ubuntu-latest R=release py=3.12	4m 43s
OS=ubuntu-latest R=release py=3.13	4m 26s
OS=ubuntu-latest R=devel py=3.13	5m 14s
	1h 11m 2s

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