fix: do not swallow context errors

[andreynering]

• Fixes context error is swallowed up, preventing errors.Is #1212
• Closes feat: Wrap error returned from run with context error #1217

[andreynering]

So... I just discovered that multiple %w are only supported starting on Go 1.20:

$ env GOTOOLCHAIN=go1.19 go test ./...
go: downloading go1.19 (darwin/arm64)
# github.com/charmbracelet/bubbletea
./tea.go:625:9: fmt.Errorf call has more than one error-wrapping directive %w
FAIL	github.com/charmbracelet/bubbletea [build failed]
FAIL

$ env GOTOOLCHAIN=go1.20 go test ./...
go: downloading go1.20 (darwin/arm64)
ok  	github.com/charmbracelet/bubbletea	0.302

By our CI failures and go.mod, it looks like we're still supposed to support 1.18 and 1.19. I think we can just keep this PR open until we move to Go 1.20 as a minimum requirement.

[desertwitch]

Resolved with #1376, #1388