Epic: Runtime Startup Refinement

[jmcphers]

This epic collects a number of connected issues around runtime startup based on user feedback.

Positron's best guess of which interpreter(s) to start and where to look

• Startup: "Forget" unused interpreters, or otherwise start them up less aggressively #3432
• Predictable order and prioritization of language runtimes at startup #1044
• Prioritize affiliated runtimes; ensure that after boot, primary runtime is active #1143
• Default runtime for new workspaces should be last used runtime #1181
• Skip certain folders when searching for interpreters and environments #5664
• No runtime starts if affiliated runtime is unavailable #1180

User/Admin configurable interpreter defaults

• Epic: Language Pack Runtime Inclusion/Exclusion/Default Settings #6202
• Python: provide inclusion/exclusion of language runtimes #3574
• Disable discovery or console for specific languages #3575
• Exclude interpreter discovery for languages not used in new project #4011

Surfacing interpreter-related settings and output; user debug-ability

• Lack of user feedback when no (suitable) interpreters installed #3468
• Provide "Select Interpreter" for R (similar to Python) #5223
• Show richer startup status in the Console #3566
• Runtimes tab for settings and overview of interpreters