Add Positron Variables Pane Methods #1324

Job	Run time
OS=macOS-latest R=release py=3.11	3m 23s
OS=windows-latest R=release py=3.11	9m 16s
OS=ubuntu-latest R=release py=3.11	5m 7s
OS=macOS-latest R=oldrel py=3.11	4m 1s
OS=ubuntu-latest R=oldrel-1 py=3.10	4m 58s
OS=ubuntu-latest R=oldrel-2 py=3.10	4m 36s
OS=ubuntu-20.04 R=oldrel-3 py=3.9	4m 42s
OS=ubuntu-20.04 R=oldrel-4 py=3.9	5m 6s
OS=ubuntu-latest R=release py=3.8	4m 55s
OS=ubuntu-latest R=release py=3.9	4m 37s
OS=ubuntu-latest R=release py=3.11	4m 25s
OS=ubuntu-latest R=release py=3.12	5m 5s
OS=ubuntu-latest R=release py=3.13	4m 35s
OS=ubuntu-latest R=devel py=3.13	5m 41s
	1h 10m 27s

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